B.f. goodrich Stormscope ii series Manual

$7.00 U.S.

Series II Weather Mapping Systems

Model WX-950

Stormscope

Pilot’s Guide

for the

CLR

Rate 20

200nm

CELL

BRT

OFF

Stormscope

System Advantages

Welcome

BFGoodrichAvionics Systems, the world’s most experienced company in air-

borne thunderstorm avoidance instruments, is pleased to welcome you to the

family of tens of thousands of pilots who are enjoying the benefits of safer

flight with a

Stormscope

weather mapping system.

The Original

Don’t be fooled by

Stormscope

system look-alikes. There is only one

Stormscope

system, and only one company that makes the

Stormscope

line

of weather mapping systems. The

Stormscope

system, the original, most ac-

curate weather mapping system is now manufactured by BFGoodrich Avion-

ics Systems.

Fly with Greater Confidence

You now own the leading instrument in the world for airborne detection and

mapping of thunderstorms. Unlike any other product, your new

Stormscope

system will enable you to make better informed thunderstorm avoidance deci-

sions so you can fly more safely and with greater confidence than ever before.

Convenient Features

The advanced, patented technology in your new

Stormscope

system was

developed over many years and is so unique,so revolutionary, it surpasses all

others. Here are some of its features:

-Precisely maps electrical discharges

-Operates in 25, 50, 100, and 200 nmi ranges

-Displays airspace in 120° forward view and 360° surrounding view

-Uses a high resolution 3-inchATI CRT display/processor

Easy to Use

The

Stormscope

system is extremely user friendly as a result of extensive

ergonomic analyses by pilots from all segments of aviation and incorporation

of this information by Human Factors engineers into the

Stormscope

system

design.

Stormscope

WX-950 Pilot’s Guide

$7.00 U.S.

Series II Weather Mapping Systems

Model WX-950

Stormscope

Pilot’s Guide

for the

Methods and apparatus disclosed and described herein have been developed solely on company funds

of BFGoodrich Avionics Systems. No government or other contractual support or relationship what-

soever has existed which in any way affects or mitigates proprietary rights of BFGoodrich Avionics

Systems in these developments. Methods and apparatus disclosed herein may be subject to U.S. Pat-

ents existing or applied for. BFGoodrichAvionics Systems reserves the right to add, improve, modify,

or withdraw functions, design modifications, or products at any time without notice.

BFGoodrich FlightSystems, Inc.

Stormscope

is a registered trademark of BFGoodrich FlightSystems, Inc.

Designed and manufactured in the United States ofAmerica by

CLR

Rate 20

200nm

CELL

BRT

OFF

Safety Summary

The following warnings and cautions appear in this guide and are repeated

here for emphasis:

WARNING

The illustrations in this guide are only examples. Never use

your

Stormscope

system to attempt to penetrate a thunder-

storm. The FAAAdvisory Circular, Subject: Thunderstorms,

and the Airman’s Information Manual (AIM) recommend

that you “avoid by at least 20 miles any thunderstorm iden-

tified as severe or giving an intense radar echo.”

CAUTION

There are several atmospheric phenomena other than nearby

thunderstorms which can cause isolated discharge points in

the strike display mode. Clusters of two or more discharge

points in the strike display mode however do indicate thun-

derstorm activity when they reappear after clearing the

screen.Avoidtheclustersandyou’llavoidthethunderstorms.

In the cell display mode, even a single discharge point may

represent thunderstorm activity and should be avoided.

Stormscope

WX-950 Pilot’s Guide

Table of Contents Page

List of Illustrations .......................................................................... v

List of Tables ................................................................................... v

Chapter 1 System Description ..................................................... 1-1

General Description................................................................................... 1-1

Display/Processor .................................................................................. 1-1

Antenna .................................................................................................. 1-1

Functional Description .............................................................................. 1-2

Cell Display Mode ................................................................................. 1-2

Strike Display Mode .............................................................................. 1-3

Features...................................................................................................... 1-3

Chapter 2 Storm Mapping Principles .......................................... 2-1

Anatomy of a Thunderstorm...................................................................... 2-1

Stages of a Thunderstorm .......................................................................... 2-2

Cumulus Stage ....................................................................................... 2-2

Mature Stage .......................................................................................... 2-2

Dissipating Stage ................................................................................... 2-2

Storm Mapping Technology ...................................................................... 2-3

The

Stormscope

System and Weather Radar ....................................... 2-3

Automatic Updating............................................................................... 2-3

Chapter 3 Operation ..................................................................... 3-1

Controls and Indicators.............................................................................. 3-1

Operating Instructions ............................................................................... 3-4

Turn On the

Stormscope

System.......................................................... 3-4

Adjust the Screen Brightness ................................................................. 3-4

Switch to the MENU Screen.................................................................. 3-6

Scroll Through the Menu Items ............................................................. 3-6

Switch to a Weather View ...................................................................... 3-6

MethodA............................................................................................ 3-6

Method B............................................................................................ 3-7

Switch Between Weather Views............................................................. 3-7

Select the Range..................................................................................... 3-8

ClearAll Discharge Points ..................................................................... 3-8

Switch Between WX Display Modes..................................................... 3-9

Run Operator-Initiated Self Test ............................................................ 3-9

Toggle Heading Stabilization On and Off............................................ 3-10

Turn Off the

Stormscope

System ....................................................... 3-11

Continuous Self Test................................................................................ 3-11

Error Messages ........................................................................................ 3-12

Non-Fatal Faults................................................................................... 3-14

Recoverable Faults ........................................................................... 3-15

Weather-Mapping-Inhibited Faults ............................................... 3-15

Heading-Related Faults ................................................................ 3-15

Stormscope

WX-950 Pilot’s Guide iii

Table of Contents (Continued) Page

Non-Recoverable Faults ................................................................... 3-15

Fatal Faults........................................................................................... 3-16

Chapter 4 Weather Display Interpretation ................................... 4-1

Introduction ............................................................................................... 4-1

Radial Spread ......................................................................................... 4-2

Typical Patterns ......................................................................................... 4-2

Three Clusters within the 200 nmi Range Ring..................................... 4-2

Two Clusters within the 200 nmi Range Ring ....................................... 4-4

Mapping Headings Past Thunderstorms .................................................... 4-4

Range Set at 200 nmi ............................................................................. 4-4

Aircraft Progresses 100 nmi................................................................... 4-5

Range Changes to 100 nmi .................................................................... 4-5

Aircraft Turns toAvoid Thunderstorms ................................................. 4-5

Special Patterns ......................................................................................... 4-7

Randomly Scattered Discharge Points ................................................... 4-7

Cluster and Splattering Within 25 nmi................................................... 4-7

Discharge Points OffAircraft’s Nose..................................................... 4-9

Line of Discharge Points While Taxiing .............................................. 4-10

Developing Cluster Within the 25 nmi Range Ring ............................ 4-11

Chapter 5 Specifications, Maintenance, & Service ..................... 5-1

Specifications ............................................................................................ 5-1

Maintenance & Service ............................................................................. 5-2

Chapter 6 Warranty Information .................................................. 6-1

Introduction ............................................................................................... 6-1

Warranty Statement ................................................................................... 6-1

Related Policies and Procedures................................................................ 6-2

Appendix A Dealer Information & Annual Performance Check .. A-1

Dealer Information ................................................................................... A-1

Equipment Information ............................................................................ A-1

Annual Performance Checks .................................................................... A-1

Table of Contents Stormscope

WX-950

iv Pilot’s Guide

List of Illustrations

Figure Title Page

1-1 WX-950 System Components..................................................... 1-1

1-2 WX-950 Functional Diagram...................................................... 1-2

1-3 WX-950 Weather Views .............................................................. 1-3

2-1 Electrical Discharges in Thunderstorms...................................... 2-1

2-2 Discharge Rate a Function ofWind Shear .................................. 2-2

3-1 Controls and Indicators ............................................................... 3-1

3-2 Self Test In Progress.................................................................... 3-5

3-3 Self Test OK ................................................................................ 3-5

3-4 360° Weather View at 200 nmi Range ........................................ 3-5

3-5 MENU Screen with Weather View Highlighted.......................... 3-6

3-6 Switching Between Weather Views............................................. 3-7

3-7 MENU Screen with WX Display Highlighted ............................ 3-9

3-8 MENU Screen with Self Test Highlighted ................................ 3-10

3-9 MENU Screen with HDG Stabilize Highlighted ...................... 3-11

3-10 MENU Screen with HDG Stabilize N/A .................................. 3-11

3-11 Error Message for a Recoverable Weather Fault....................... 3-12

3-12 Weather Mapping Inhibited Screen ........................................... 3-15

3-13 Error Message for a Heading-Related Fault.............................. 3-16

3-14 Weather View with a Heading Flag........................................... 3-16

3-15 Error Message for a Fatal Fault................................................. 3-16

4-1 Airspace Diagram........................................................................ 4-1

4-2 Three Clusters Within 200 nmi ................................................... 4-3

4-3 Range Changed to 100 nmi ......................................................... 4-3

4-4 Two Clusters Within 200 nmi...................................................... 4-4

4-5 Range Set at 200 nmi .................................................................. 4-5

4-6 Aircraft Progresses 100 nmi........................................................ 4-6

4-7 Range Changes to 100 nmi ......................................................... 4-6

4-8 Aircraft Turns To Avoid Thunderstorms ..................................... 4-7

4-9 Randomly Scattered Discharge Points ........................................ 4-8

4-10 Cluster and Splattering Within 25 nmi........................................ 4-8

4-11 Discharge Points OffAircraft’s Nose .......................................... 4-9

4-12 Line of Discharge Points While Taxiing ................................... 4-10

4-13 Developing Cluster Within 25 nmi Range Ring ....................... 4-11

List of Tables

Table Title Page

3-1 Controls and Indicators ............................................................... 3-1

3-2 Error Messages.......................................................................... 3-12

5-1 WX-950

Stormscope

System Specifications............................. 5-1

Stormscope

WX-950 Pilot’s Guide v

Stormscope

WX-950 System Description

Pilot’s Guide 1-1

Display/Processor

The display/processor mounts into any standard 3-inch ATI cutout in the

aircraft instrument panel. The display/processor houses two main func-

tional components: a high resolution, raster scan CRT display with a dedi-

cated graphics controller, and two powerful processors on which the

Stormscope

software runs. The processors are reprogrammable to allow

for future enhancements to the lightning detection software.

Antenna

This combined crossed-loop and sense antenna is sealed in an aerodynamic

flat-pack and mounted on the outside of the aircraft. The

Stormscope

systemcancorrelatetheelectricandmagnetic signatures of lightning strikes

Stormscope

WX-950 Pilot’s Guide

Chapter 1

System Description

General Description

The

Stormscope

Series IIWeather Mapping System,model WX-950 detects

electrical discharges associated with thunderstorms within a 200 nmi radius

of the aircraft and displays the location of the associated thunderstorms.

The

Stormscope

system is a passive system that listens for electromagnetic

signals with a receiving antenna. There’s no transmitter and no harmful trans-

missions. The system operates as well on the ground as in the air, thereby

giving the pilot important planning information even before takeoff.

Figure 1-1 shows the two major components of the Stormscope®system. Fig-

ure 1-2 shows how the components are connected to each other and to other

aircraft systems.

Figure 1-1. WX-950 System Components

Display/Processor

Antenna

1-2 Pilot’s Guide

System Description Stormscope

WX-950

better than other systems due to its patented sense channel technology. The

antenna has also been improved for the model WX-950

Stormscope

sys-

tem to help filter out pulsed noise from sources other than atmospheric

electrical discharges.

CLR

Rate 20

200nm

CELL

BRT

OFF

Discharge Signals

Test Strike

Control

Heading

Input

Power Input

±12 V dc

External

Clear

Input*

*Not Required

Comm

Mic

Inhibit*

Display/Processor

Stormscope

Model WX-950

Power

Input

11–32 V dc

Heading

Valid

Input

Electromagnetic Signals Radiating from

Atmospheric Electrical Discharges

Associated with Thunderstorms

Antenna

Figure 1-2. WX-950 Functional Diagram

Functional Description

The antenna detects the electric and magnetic fields generated by intra-cloud,

inter-cloud, or cloud-to-ground electrical discharges that occur within a 200

nmi radius of the aircraft and sends the resulting “discharge signals” to the

display/processor.The processor digitizes, analyzes, and converts the discharge

signals into range and bearing data then stores the data in memory. The

Stormscope

system displays discharges as storm cells or strikes depending

on the display mode selected. (See figure 1-3.)

Cell Display Mode

In the cell display mode, the

Stormscope

system plots a “+” symbol (dis-

charge point) on the display when it detects associated discharges within

the selected range and view. The processor will plot another “+” close to

the first for each additional discharge determined to be associated with the

group. The processor will not plot a “+” for any discharge not associated

with a group unless it’s detected within a 25 nmi radius of the aircraft. The

effect of this clustering algorithm is to display the location of storm cells

instead of individual discharges.The cell display mode is most useful dur-

ing periods of heavy electrical discharge activity. Using the cell display

mode during these periods frees the pilot from sifting through a screen full

of discharge points to determine exactly where the storm cells are located.

Stormscope

WX-950 System Description

Pilot’s Guide 1-3

360° View, CELL Display Mode 120° View, STRIKE Display Mode

Figure 1-3.WX-950 Weather Views

CLR

Rate 20

200nm

CELL

BRT

OFF

CLR

Rate 16

200nm

STRIKE

BRT

OFF

Strike Display Mode

In the strike display mode, the

Stormscope

system immediately plots an

“x” symbol (discharge point) on the display for each individual discharge

it detects within the selected range and view. The strike display mode plots

discharge points on the display in relation to where the discharges are actu-

ally detected instead of plotting them close to an associated group of dis-

charge points as is done in the cell display mode. The strike display mode

is most useful during periods of light electrical activity because it may plot

discharges associated with a building thunderstorm sooner than the cell

display mode would.

Features

• Four operator-selectable weather ranges:

–25 nmi

–50 nmi

–100 nmi

–200 nmi

• Two operator-selectable weather views (figure 1-3):

–360° view of surrounding airspace

–120° forward view

• Three types of self test:

–Power-up self test

–Continuous self test

–Operator initiated self test

1-4 Pilot’s Guide

System Description Stormscope

WX-950

• Heading stabilization – automatically repositions discharge points on the

display relative to the latest aircraft heading when connected to a compat-

ible heading system

• Localandremoteclear–allowsoperatorto clear displayed dischargepoints

using a button on the front of the

Stormscope

display or from a remotely-

mounted “clear screen” button (not supplied)

• Discharge rate indicator – displays estimated average discharge rate per

minute for current range and view

• Mic inhibit – inhibits thunderstorm processing when the communications

transmitter is keyed to prevent the processing of corrupted data (some

aircraft need to use this feature, others don’t)

• Integrity monitor – animated indicator on the display confirms that the

Stormscope

system is working. This feature is most useful during peri-

ods of no electrical activity.

• Power/brightness control – allows operator to adjust the CRT brightness

and to turn the

Stormscope

system on and off

• Four buttons – these function keys perform various functions depending

on what mode the

Stormscope

system is in and what screen is being

displayed. This variability allows for flexibility and future expansion.

• Cell and strike display modes – allows you to view all individual dis-

charges (strikes) or groups of discharges (cells)

Stormscope

WX-950 Storm Mapping Principles

Pilot’s Guide 2-1

Chapter 2

Storm Mapping Principles

Anatomy of a Thunderstorm

The

Stormscope

model WX-950 is intended to help pilots avoid the dangers

associated with thunderstorms (convective wind shear, lightning, icing, torna-

does, etc.). The

Stormscope

system locates thunderstorms by detecting the

electrical discharges that thunderstorms always generate. Figure 2-1 shows

how thunderstorms create electrical discharges and radiate electromagnetic

signals.

a. The convective flow of air currents (warm air going up and cold air go-

ing down) leads to friction between the opposing air currents and wind

shear in the space between the opposing air currents. The closer together

the opposing air currents are, the greater the shearing force of the air

currents.

b. The friction between the opposing air currents causes electrical charges

in the area to separate.As positive (+) and negative (–) electrical charges

are separated, they accumulate in masses of similar charges (positive

charges near the top of the cloud and negative charges near the bottom).

c. Electrical discharges occur as the accumulated masses of separated posi-

tive and negative charges attempt to rejoin. These discharges continue to

occur repetitively as long as the convective wind shear persists.A few of

the discharges are visible as lightning, but most electrical discharges oc-

cur within a cloud or between clouds and are hidden by those clouds.

Only a small percentage of discharges occurs between the clouds and the

ground. Cloud to ground lightning occurs when the negatively charged

lower part of a cloud induces a positive charge on an object on the ground.

The immense charge separation finally breaks down the insulating air

and a discharge occurs dumping negative charge from the cloud onto the

object and the surrounding ground.

d. All electrical discharges radiate electromagnetic signals in all directions

at the speed of light. The electromagnetic signals have unique character-

istics and varying rates of recurrence and signal strength.

Stormscope

WX-950 Pilot’s Guide

Warm Air Mass

Cold Air Mass

Warm Air Mass

Cold Air Mass

abbc d

Figure 2-1. Electrical Discharges in Thunderstorms

2-2 Pilot’s Guide

Storm Mapping Principles Stormscope

WX-950

Figure 2-2 shows that the rate of electrical discharges detected in an area is

directly related to the amount of convective wind shear turbulence present. In

fact, as convective wind shear increases, the rate of electrical discharges in-

creases at an increasing rate. This relationship means that if you find the elec-

trical discharges, you’ve found the wind shear.

Stages of a Thunderstorm

All thunderstorms begin as cumulus clouds, build to an intense mature stage,

and finally dissipate. Each of these stages in the life of a thunderstorm present

a different set of dangers to aircraft.Your

Stormscope

system maps all stages

in the life of a thunderstorm so that you won’t be caught unaware by a thun-

derstorm that can build, mature, and dissipate in as little as 20 minutes.

Cumulus Stage

The cumulus or beginning stage of a thunderstorm is usually precipitation

free. In this stage, the risks to an aircraft and its occupants include strong

vertical winds, severe turbulence, icing, and convective wind shear.

Mature Stage

In the mature and most intense stage of a thunderstorm, the water droplets

within the cloud collide and combine to form rain and hail and, at cooler

temperatures, sleet and snow. This stage poses many hazards to aircraft

including heavy precipitation, high winds, convective wind shear, severe

turbulence, downbursts, hail, icing, tornadoes, and lightning.

Dissipating Stage

In the dissipating stage, the updraft weakens and at the same time, the

convective wind shear and other hazardous conditions begin to subside.

There may be high rainfall rates in this stage, but the severe dangers are

diminishing.

Light Moderate

Increasing Turbulence Due to Convective Wind Shear

Increasing Rate of

Electrical Discharges

Severe

Figure 2-2. Discharge Rate a Function ofWind Shear

Stormscope

WX-950 Storm Mapping Principles

Pilot’s Guide 2-3

Storm MappingTechnology

The

Stormscope

System andWeather Radar

The storm mapping technology used in the

Stormscope

system is funda-

mentally different than the technology used in weather radar. Weather ra-

dar operates by transmitting UHF radio waves in the direction of interest

and then receiving echoes from water droplets, whereas the

Stormscope

system operates by receiving signals already present in the atmosphere

due to electrical discharges. The

Stormscope

system analyses the unique

characteristics of these signals, their signal strength, and their varying rates

of recurrence to determine the location and intensity of the thunderstorms

that generated the discharges. The

Stormscope

system can receive radi-

ated electromagnetic signals from electrical discharges up to 200 nmi away.

One disadvantage of weather radar is that the cumulus stage of a thunder-

storm (usually precipitation free) is unlikely to appear on weather radar;

however, it generally does contain electrical discharges which will appear

on your

Stormscope

display as a light but increasing cluster of discharge

points.

Another disadvantage of weather radar is that due to attenuation, it may

not see the “storm behind the storm” or may understate its intensity.Your

Stormscope

system is not subject to attenuation. With the

Stormscope

system, electrical discharges are mapped throughout the storm area. The

size of the cluster of discharge points on your

Stormscope

system indi-

cates the size of the storm area. The speed with which the discharge points

appear indicate the intensity of the storm regardless of the size of the clus-

ter. The more intense the storm, the faster the discharge points reappear.

Automatic Updating

The

Stormscope

system receives and processes electrical discharge infor-

mation continuously and updates the screen as needed, which may be many

times every second. Even though the electromagnetic signals from electri-

cal discharges are of very short duration, the

Stormscope

system stores

the resulting discharge points in memory and displays each point for a

maximum of 3minutesbeforeitiserasedfromthescreenand frommemory.

In the 360° view, the

Stormscope

system can store and display 512 dis-

charge points within the selected range. In the 120° view, the

Stormscope

systemcanstore anddisplay256dischargepointswithin the selected range.

Whenthenumberofelectricaldischargesexceedsthemaximumdisplayable

capacity in a given view within a 3-minute interval, the oldest discharge

point in memory and on the screen in that view is erased and replaced with

the newest discharge point.This process continues to replace old discharge

points with new ones to make sure that discharge points on the screen

represent the most recent electrical discharges. In a typical thunderstorm,

all the points on the screen may be replaced with new points every 1 to 2

minutes. In a severe thunderstorm, the display may be completely updated

every 30 to 60 seconds.

Stormscope

WX-950 Operation

Pilot’s Guide 3-1

Chapter 3

Operation

Controls and Indicators

Figure 3-1 calls out all the major controls and indicators on the

Stormscope

model WX-950. Table 3-1 is the legend for figure 3-1.

CLR

Rate 20

200nm

CELL

BRT

OFF

FLG

CLR

Rate 8

200nm

STRIKE

BRT

OFF

Weather

Self

HDG

Stabilize

Test

Display

View

360$

TEST

CELL

PASSED

BRT

OFF

SELF-TEST

WX-950

SYSTEM

TEST

PROGRESS

ALL

TESTS

PASSED

BFGoodrich

(C)

1995

...

BRT

OFF

FlightSystems,Inc.

ERROR

Processor

Fault

Continued

not

possible

operation

BRT

OFF

360° View

Self-Test Screen Error Message

120° View Menu

12345678910 1311 1412 15 1716 18

Stormscope

WX-950 Pilot’s Guide

Figure 3-1. Controls and Indicators

Table 3-1. Controls and Indicators

Item Name Description

1 Buttons

(4 places) The four gray buttons protruding from the bottom

half of the bezel are momentary contact switches.

The

Stormscope

system assigns them different

functions depending on which screen and options

are currently active. The system automatically

debounces the buttons so that only the first stroke

of an accidental multiple key stroke is

acknowledged.

2 Discharge Points The position of these + symbols in cell display

mode, and xsymbols in strike display mode

indicates the azimuth and range of detected elec-

trical discharge activity. Discharge points

sometimes overlap to form clusters. A large

cluster indicates that the thunderstorm covers a

3-2 Pilot’s Guide

Operation Stormscope

WX-950

Table 3-1. Controls and Indicators (Continued)

Item Name Description

2 Discharge Points

(Continued) large area. A dense cluster indicates an intense

thunderstorm. The size of the discharge points

increases as the selected range decreases in order

to enhance the storm clustering effect on the

shorter ranges. The

Stormscope

system can

display 256 discharge points in the 120° view, and

512 discharge points in the 360° view. The latest

discharge points (none older than 3 minutes) are

stored in memory and displayed even if you

switch ranges or views and then switch back to the

original range or view.

3 Button Labels

(4 places) These labels indicate the function of the adjacent

buttons. The labels change from screen to screen.

4 Discharge Rate

Indicator This indicator displays an estimate of the average

number of electrical discharges detected per

minute in the selected range and view. The

indicator is updated every 5 seconds. The range of

the indicator is 0–999.

5 Range Indicator This indicator displays the numerical value of the

current range displayed on the screen. This value

corresponds to the distance from the aircraft to the

outer range ring. The possiblities are 25, 50, 100,

and 200 nmi.

6 Integrity Monitor This bar rotates to indicate that the

Stormscope

system is working. This indicator is most useful

during periods of no lightning activity.

7 Aircraft Symbol This symbol indicates the location and heading of

your aircraft relative to the thunderstorm activity.

8 25 nmi Range

Ring This solid ring is displayed on every range of both

weather views to keep you informed of any

thunderstorm activity within a 25 nmi radius of

your aircraft.

9 Outer Range Ring The outer range ring indentifies the outer

boundary of the current range. In the 360° view,

the outer range ring is made up of 8 arcs spaced

30° apart along a circle centered on the aircraft

symbol. In the 120° view, the outer range ring is

made up of 2 arcs each spaced 30° on either side

of the aircraft heading along a circle centered on

the aircraft symbol. If the range is set to 25 nmi in

either view, the outer range ring is a solid ring

instead of arcs. The numerical value of the radius

of the outer range ring is displayed in the range

indicator at the bottom of the screen.

Stormscope

WX-950 Operation

Pilot’s Guide 3-3

Table 3-1. Controls and Indicators (Continued)

Item Name Description

10 Azimuth Marker The azimuth markers help to quantify the angular

location of electrical discharges relative to the

aircraft. In the 360° view, 8 short radial markers

are spaced 30° apart around the outside of the

outer range ring. In the 120° view, 4 azimuth

markers radiate out from the aircraft symbol at

30° and 60° on either side of the aircraft heading.

11 CRT Display The display is a 2.6-inch diameter, green

phosphor CRT. The entire display screen serves as

a multipurpose indicator. It displays electrical

discharge activity and various menu items and

status messages.

12 Self-Test Result

Indicator This indicator displays the current self test status.

13 Heading Flag

Indicator The heading flag indicator consists of the letters

“FLG” in reverse video just above the menu

button label on both weather views. This indicator

will appear if the

Stormscope

system detects a

heading invalid flag from the aircraft navigational

system while heading stabilization is enabled on

the

Stormscope

system. Upon receiving a

heading flag, the

Stormscope

system will also

clear the display and begin operating in a “fixed

card” manner without heading stabilization.

14 WX Display

Mode Indicator This indicator reports the current wx (weather)

display mode (CELL or STRIKE). Weather is

defined as electrical activity. The indicator is

present on both the 360° and the 120° views.

15 Power/Brightness

Control

(OFF/BRT)

Rotating this knob clockwise turns on the

Stormscope

system and increases the brightness

of the display. Rotating this knob counter-

clockwise decreases the brightness of the display

and turns off the

Stormscope

system when the

knob reaches its fully counterclockwise position.

16 Error Message

Indicator This indicator appears when the

Stormscope

system detects a fault. The error message includes

an error number, a short description of the fault,

and whether continued operation is possible. In

most cases, the operator must press any button to

acknowledge and clear the error message and to

resume operation. If a recoverable fault goes away

while the error message is being displayed, the

error message will disappear after it has been

displayed for at least 10 seconds.

3-4 Pilot’s Guide

Operation Stormscope

WX-950

Table 3-1. Controls and Indicators (Continued)

Operating Instructions

This section lists procedures for configuring and operating the

Stormscope

system. The procedures are organized into tasks.There is no predefined order

for performing the tasks (other than turning on the

Stormscope

system first).

You should perform all the tasks at least once after your

Stormscope

system

is first installed; that way you will be familiar with how to use the features

before you actually need to use them.

Turn On the

Stormscope

System

a. Rotate the OFF/BRT knob clockwise about 180 degrees.

The switch will click and the

Stormscope

system will begin the

power-up self test and will display the SELF-TEST screen with the

message SYSTEM TEST IN PROGRESS… (See figure 3-2.) The

power-up self test takes about 25 seconds to ensure that all major

Stormscope

systemfunctionsareoperating properly. Functionstested

include antenna reception, memory, and microprocessor functions.

If the

Stormscope

system detects no faults, the SELF-TEST screen

will display the message ALL TESTS PASSED. (See figure 3-3.)

After a few seconds, the display will switch to the 360° weather view

screen set at the 200 nmi range. (See figure 3-4.) The WX Display

mode setting and the HDG Stabilize setting will be in the same states

as they were in when the

Stormscope

system was last used.

If the

Stormscope

system detects a fault, an error message is dis-

played. Refer to the section on error messages later in this chapter for

more information on error messages.

Note

The

Stormscope

system may complete its power-up self

test before the CRT display comes on. In this case, it is pos-

sible that the first screen you see will be the 360° weather

view screen or an error message resulting from the self-test.

Adjust the Screen Brightness

a. Rotate the OFF/BRT knob clockwise to increase the brightness of

the display or counterclockwise to decrease the brightness of the

display.

Item Name Description

17 Highlighted

Menu Item A highlighted menu item identifies the currently

selected menu item.

18 Menu Item Status

Indicator These indicators display the status of the test or

function named in the menu item.

Stormscope

WX-950 Operation

Pilot’s Guide 3-5

CLR

Rate 20

200nm

CELL

BRT

OFF

SELF-TEST

WX-950

SYSTEM

TEST

PROGRESS

BFGoodrich

(C)

1995

. . .

FlightSystems,Inc.

BRT

OFF

SELF-TEST

WX-950

SYSTEM

TEST

PROGRESS

ALL

TESTS

PASSED

BFGoodrich

(C)

1995

. . .

FlightSystems,Inc.

BRT

OFF

Figure 3-2. SelfTest In Progress

Figure 3-3. SelfTest OK

Figure 3-4. 360° WeatherView at 200 nmi Range

3-6 Pilot’s Guide

Operation Stormscope

WX-950

Switch to the MENU Screen

a. From either of the two weather views (360° or 120°) press the MENU

button. (See figure 3-1.)

The display will switch to the MENU screen. The first menu item,

Weather View, will be highlighted. (See figure 3-5.)

Scroll Through the Menu Items

a. Switch to the MENU screen (figure 3-5).

b. Press the down arrow button to move the highlighting bar down the

menu.

When the highlighting bar reaches the last menu item, pressing the

down arrow button again will move the highlighting bar up to the

first item in the list.

c. Press the up arrow button to move the highlighting bar up the menu.

When the highlighting bar reaches the first menu item, pressing the

up arrow button again will move the highlighting bar down to the

last item in the list.

Switch to a Weather View

There are two ways to get to a weather view from the MENU screen. These

are described below as methodA and method B.

Method A

a. On the MENU screen, scroll through the menu items until the

menu item Weather View is highlighted. (See figure 3-5.)

b. Press the 360° button to switch to the 360° weather view screen or

press the 120° button to go to the 120° weather view screen.

Weather

Self

HDG

Stabilize

Test

Display

View

120$

360$

CELL

PASSED

BRT

OFF

Figure 3-5. MENU Screen with WeatherView Highlighted

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