Narco Avionics AR850 User manual

AR850 ALTITUDE REPORTER
(L/C)30,700ft
INSTALLATION/OPERATION MANUAL
30,700 FEET
MANUAL PART NO. 03753-0623
®NARCO AVIONICS INC.
270 COMMERCE DRIVE
FORT WASHINGTON, PENNSYLVANIA, 19034
U.S.A.
©COPYRIGHT, NARCO AVIONICS INC., 1990
PRINTED IN U.S.A. JULY, 2003

NOTICE
While every effort has been made by Narco Avionics Inc. to ensure
accuracy in the preparation of this Installation Manual, Narco
assumes no responsibility for errors or omissions.
NARCO AVIONICS INC. CAN BE REACHED BY CALLING:
PHONE: [phone]
FAX: [phone]
CUSTOMER SERVICE LINE: 215-643-2905
TABLE OF CONTENTS

SECTION TOPIC PAGE
1.1 Introduction ...................................... 1-1
1.1.1 Manual Organization ............................... 1-1
1.2 Product Description ............................... 1-1
1.3 Design Features ................................... 1-2
1.4 Product Specifications ............................ 1-2
1.5 Ordering Information for units/accessories ........ 1-4
1.6 Licensing Requirements ............................ 1-4
1.7 TSO Explanation ................................... 1-5
1.8 Environmental Qualification Form .................. 1-7
2.1 Introduction ...................................... 2-1
2.2 Preliminary Procedures ............................ 2-1
2.2.1 Preliminary Inspection ............................ 2-1
2.2.2 Preliminary Bench Check ........................... 2-1
2.3 Mechanical Installation ........................... 2-3
2.4 Electrical Installation ........................... 2-9
2.4.1 AR850 to Transponder Compatibility ................ 2-9
2.4.2 AR850 ENABLE Requirements ......................... 2-9
2.4.3 Primary Power Requirement ......................... 2-10
2.4.4 AR850 Altitude Code Line Characteristics .......... 2-10
2.4.5 Interconnect Cable Fabrication .................... 2-11
2.4.6 Correspondence Test ............................... 2-12
2.4.6.1 Test Equipment Requirements ....................... 2-12
2.4.6.2 Test Procedure .................................... 2-12
2.4.7 Interconnect Wiring Diagrams ...................... 2-14
2.4.7.1 AR850 to AT155/AT150/AT50/50A Installation ........ 2-14
2.4.7.2 AR850 to KING KT76/78 ............................. 2-15
2.4.7.3 AR850 to KING KT76A/78A/79 ........................ 2-16
2.5 Post Installation Tests ........................... 2-17
2.5.1 Preflight Tests ................................... 2-17
3.1 General ........................................... 3-1
3.2 Operation ......................................... 3-1
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE PAGE
2-1 Bench Test Set-up ................................. 2-1
2-2 AR850 Mechanical Dimensions ....................... 2-4
2-3A AR850 Tray Template ............................... 2-5
2-3B AR850 Case Template ............................... 2-7
2-4 P101 Assembly ..................................... 2-11
2-5 P101 Pin Assignments .............................. 2-12
2-6 AR850 to AT155/AT150/AT50/50A Interconnections .... 2-14
2-7 AR850 to KT76/78 Interconnections ................. 2-15
2-8 AR850 to KT76A/78A/79 Interconnections ............ 2-16
7/03 1-i

THIS PAGE LEFT INTENTIONALLY BLANK

GENERAL INFORMATION
SECTION 1
7/03 1-1
1.1 INTRODUCTION
In support of the Narco Avionics AR850 Altitude Reporter, this
manual provides detailed installation and maintenance procedures.
This manual is intended for use by persons who are qualified to
service the equipment described in this manual pursuant to current
regulatory requirements.
1.1.1 MANUAL ORGANIZATION
Organized into three sections, this manual provides the following:
SECTION 1 GENERAL INFORMATION - Product description, ordering
information, specifications, environmental category
and licensing requirements.
SECTION 2 INSTALLATION - Detailed information for performing
the mechanical and electrical installation.
SECTION 3 OPERATION - Operation of the AR850 system is
covered only to the extent of making the electrical
tests necessary to confirm proper operation.
NOTE : Maintenance Manuals are not available to the field
because all maintenance not covered in this installation
manual must be performed at the factory for the
following reasons :
1. Sensor Scaling selected parts.
2. Special Programmed PROM for linearization of
the sensor output.
1.2 PRODUCT DESCRIPTION
The AR850 Altitude Reporter is a TSO'd pressure altitude
digitizer. Sensing atmospheric pressure, the AR850 converts
pressure/altitude information into digitized altitude data, ready
for transmission to air traffic control centers via the aircraft's
transponder during a Mode C interrogation.
The AR850 L/C (30,700 ft.) differs from the 25,000 and 30,700 ft.
versions in mechanical packaging and altitude limit only. The pin
out (because of the smaller connector) is different from the
original model. The electronics remain the same.
The AR850 L/C (30,700 ft.) is not pin compatible and requires
different mounting holes than Narco's older AR500 Atltitude
Reporter.

NARCO AVIONICS AR850
1-2 7/03
1.3 DESIGN FEATURES
- Reports altitude up to 30,700 feet (9,357 meters).
- Incorporates a Piezoresistive pressure sensor.
- No complex gears, shafts or optical discs are used
which increases the unit's reliability.
- Directly compatible with most current production
transponders.
- Meets FAA TSO C88(a).
- Lightweight: less than 1 pound.
- Compact: Remote mounts easily within the aircraft's
structure.
- Operates on either 14 or 28 Vdc.
1.4 PRODUCT SPECIFICATIONS
ALTITUDE REPORTING RANGE
-1,000 to 30,700 feet referenced to 29.92 inches of mercury.
CODE OUTPUT
The digitized output format is in accordance with the U.S.
National Standard for Common System Component Characteristics
for the IFF Mark X (SIF)/Air Traffic Control Radar Beacon
System, SIF/ATCRBS as amended December 27, 1963 and is the
same code specified in the International (ICAO) Standard Code
for SSR Pressure Altitude Transmission.
ACCURACY
The digitizer reproduces the pressure altitude in digital
form with a tolerance of ±50 feet referenced to 29.92 inches
of mercury as measured at any transition point of the digital
code over the range of -1,000 to 30,700 feet, as shipped from
the factory.
MECHANICAL
SIZE : See UNIT DIMENSIONS on page 2-4.
WEIGHT : AR850 Unit 0.7 lbs. ( 0.318 kg.)
AR850 Tray 0.090 lbs. (0.041 kg.)

GENERAL INFORMATION
SECTION 1
7/03 1-3
1.4 PRODUCT SPECIFICATIONS, Continued
ELECTRICAL
INPUT POWER : 11 to 32 Vdc at 1.4 amps maximum during
the first 3 minutes of operation. 0.35
amps average after 3 minutes of operation.
ENVIRONMENTAL
TSO C88 (a)
DO160B ENVIRONMENTAL CATAGORY B1B/A/NOM/XXXXXXBBBBBB
CODE LINE OUTPUT CHARACTERISTICS
Data bit outputs are compatible with DTL, TTL, MOS,
CMOS, ECL or any other logic interface requiring the
following characteristics:
BIT OFF OUTPUT STATE : Will accept from the transponder
a voltage pullup of +50 Vdc at a leakage current of 100
microamps.
BIT ON OUTPUT STATE : 0.75 Vdc at 50 ma. Sinking
current
1.1 Vdc at 100 ma. sinking
current
DIGITIZER ENABLE SIGNAL INPUT
The AR850 will accept continuous type digitizer enable signal
information.
DIGITIZER ENABLED:
1. J101-6 : When pin 6 is grounded the digitizer is
enabled.
DIGITIZER INHIBITED:
1. J101-6 : When pin 6 is open circuited or a DC
voltage greater than 0.5 volts is applied, the
digitizer is inhibited.

NARCO AVIONICS AR850
1-4 7/03
1.5 ORDERING INFORMATION FOR UNITS AND ACCESSORIES
The following list identifies the AR850 system and the order
number to use to obtain the complete system. The accessory items
of the system may be ordered by using the part numbers listed
opposite the item.
┌──────┬─────────────┬─────────────────────────────┬────────────┐
││││Accessory/ │
│Item │Order No. │Description │Individual │
│No. │││Part No. │
├──────┼─────────────┼─────────────────────────────┴────────────┤
│1 │03753-0306 │AR850 L/C (30,700 ft.) 01447-0103 │
│││With : Installation Kit │
│││Environmental Qualification │
│││Form (03753-0621) │
│││(DOES NOT INCLUDE MOUNTING TRAY) │
├──────┼─────────────┼──────────────────────────────────────────┤
│││ACCESSORIES : │
│││Mounting Tray Kit 03753-0305 │
│││Installation Kit 03753-0503 │
├──────┼─────────────┼──────────────────────────────────────────┤
││Quantity │Installation Kit : │
│2 │1 │15 Pin Connector (P101) 41364-0004 │
│3 │1 │Connector Hood (P101) 41307-0011 │
│4 │15 │Connector Pins (P101) 41372-0010 │
││││
││││
│6 │2 │Screw, 4-40 x 5/8 84536-0708 │
│7 │1 │Cockpit Label, 30,700 ft. 04968-0001 │
└──────┴─────────────┴──────────────────────────────────────────┘
1.5.1 Miscellaneous Items Required but Not Supplied:
1. Sufficient length of #22 AWG stranded hook-up wire
2. A resettable circuit breaker or fuse rated at 2 amps for
device protection.
3. Sufficient length of 1/4 inch ID hosing to connect to
the AR850's plastic static adapter for venting to
atmosphere.
4. Mounting Hardware.
1.6 LICENSING REQUIREMENTS
There are no operator or aircraft license requirements for this
type of equipment.

GENERAL INFORMATION
SECTION 1
7/03 1-5
1.7 TSO EXPLANATION
The AR850 is designed to be remote mounted within a non-
pressurized but controlled temperature location within an aircraft
that is operated up to 30,700 MSL.
This equipment requires direct current power, but may be installed
in aircraft having additional on-board alternating current
sources.
There are 18 "Environmental Test Procedures" established in RTCA
Document DO-160B, dated July 1984. These are identified on the TSO
Nameplate. The following identifies the Environmental Categories
to which the AR850's are designed, the sections of DO-160B
covering the test procedures, and an explanation of each category.
Temperature and Altitude (Section 4.0 Rev. 1)
│Temperature Variation (Section 5)
││Humidity (Section 6)
│││Vibration (Section 8)
││││Explosion (Section 9)
│││││Waterproofness (Section 10)
││││││Fluid Susceptibility (Section 11)
│││││││Sand and Dust (Section 12)
││││││││
B1/B/A/NMO/X X X X X X Z B B B B B B
│││││││││
Fungus Resistance (Section 13)││││││││
Salt Spray (Section 14)│││││││
Magnetic Effect (Section 15)││││││
Power Input (Section 16)│││││
Voltage Spike (Section 17)││││
Audio Frequency Conducted Susceptibility (Section 18)│││
Induced Signal Susceptibility (Section 19)││
Radio Frequency Susceptibility (Section 20)│
Emission of Radio Frequency Energy (Section 21)
* AR850 also tested for shock operation (Sections 7, 7.2, 7.3).
Temperature and Altitude - Category B1
Temperature, Operating:
Low Operating Temperature -20°C (-4°F)
High operating Temperature +55°C (+131°F)
Short Time Operating Temperature, High +70°C (+158°F)
Temperature, Non-Operating:
Ground Survival Temperature, Low -55°C (-67°F)
Ground Survival Temperature, High +85°C (+185°F)
Altitude, Non-Pressurized: 7,620 M (25,000 ft.)

NARCO AVIONICS AR850
1-6 7/03
Temperature Variation - Category B
Low Operation (-20°C) to Temperature may vary between
High Operation (+55°C). high and low limits at a
rate of 5 degrees C minimum
per minute.
Humidity - Category A
These limits have been tested under the Standard Humidity
Environment of: +50°C (+122°F) at 95% relative humidity, reduced to
+38°C (+100°F) with a relative humidity maintained in excess of
85%.
This cycle was repeated twice for a total of 48 hours of exposure.
Within 15 minutes after exposure, the units were operated and met
all specifications.
[TSO requires that all specifications be met within 4 hours after
exposure.]
Vibration - Category NMO
Maximum vibration limits are:
0.100" double amplitude from 5 Hz. to 17 Hz.
1.5 G constant acceleration from 17 Hz. to 500 Hz.
0.5 G constant acceleration from 500 Hz. to 2000 Hz.
Not Applicable - Category X
The following six Environmental Conditions do not normally exist
in Civil Aircraft, when recognized installation practices are
adhered to and are, therefore, not tested.
Explosion - Category X
Waterproofness - Category X
Hydraulic Fluid - Category X
Sand and dust - Category X
Fungus Resistance - Category X
Salt Spray - Category X
Magnetic Effect - Category Z
With this equipment operating, it may be placed at a distance less
than 0.3 meter from a free magnet with a 1°or less deflection of
the magnet.