Midcontinent CH93 Series Technical Document

ManualNumber

9018205
RevisionF
April1,2021

Manual Number 9018205 Revision F, April 1, 2021 1
FOREWORD
This manual provides information intended for use by persons who, in accordance with current
regulatory requirements, are qualified to install this equipment. If further information is required,
please contact:
Mid-Continent Instruments and Avionics
Attn: Customer Service Dept.
9400 E. 34th Street N.
Wichita, KS 67226 USA
PH [phone]
FX [phone]
www.mcico.com
We welcome your comments concerning this manual. Although every effort has been made to
keep it free of errors, some may occur. When reporting a specific problem, please describe it
briefly and include the manual part number, the paragraph/figure/table reference and the page
number. Send your comments to:
Mid-Continent Instruments and Avionics
Attn: Technical Publications
9400 E. 34th Street N.
Wichita, KS 67226 USA
PH [phone]
FX [phone]
[email protected]
All products produced by Mid-Continent Instrument Co., Inc., including those identified as
Mid-Continent Instruments and Avionics or True Blue Power, are designed and manufactured
in Wichita, KS, USA.
© Copyright 2018
Mid-Continent Instrument Co., Inc.
Download the current
version of this installation
manual using your
smartphone or tablet.

Manual Number 9018205 Revision F, April 1, 2021 2
TABLE OF CONTENTS
SECTION 1GENERAL DESCRIPTION ........................................................................................ 4
1.1INTRODUCTION ...................................................................................................................... 4
1.2PHYSICAL ATTRIBUTES ........................................................................................................ 4
1.3MODEL AND PART NUMBER IDENTIFICATION .................................................................... 6
1.4TECHNICAL SPECIFICATIONS .............................................................................................. 6
SECTION 2PRE-INSTALLATION CONSIDERATIONS ............................................................... 8
2.1COOLING ................................................................................................................................. 8
2.2EQUIPMENT LOCATION ......................................................................................................... 8
2.3ROUTING OF CABLES ............................................................................................................ 8
2.4LIMITATIONS ........................................................................................................................... 8
2.5MODIFICATION ....................................................................................................................... 9
SECTION 3INSTALLATION ....................................................................................................... 10
3.1GENERAL .............................................................................................................................. 10
3.2PRE-INSTALLATION INSPECTION ...................................................................................... 10
3.3PARTS ................................................................................................................................... 10
3.4CABLE HARNESS ................................................................................................................. 11
3.5INSTALLATION ...................................................................................................................... 13
SECTION 4OPERATION ............................................................................................................ 14
4.1UNIT ARCHITECTURE .......................................................................................................... 14
4.2CLOCK AND USB PROTECTIVE FEATURES ....................................................................... 14
4.3USB OPERATION .................................................................................................................. 15
4.4DIMMING FUNCTIONS .......................................................................................................... 15
4.5OPERATIONAL MODES ........................................................................................................ 17
4.6TEMPERATURE PROBE INSTALLATION ............................................................................ 28
SECTION 5CONFORMANCE ..................................................................................................... 30
5.1INSTRUCTIONS FOR CONTINUED AIRWORTHINESS ....................................................... 30
5.2ENVIRONMENTAL QUALIFICATION STATEMENT ............................................................. 31

Manual Number 9018205 Revision F, April 1, 2021 3
REVISION HISTORY
Rev Date Detail Approved
A 07/15/2014 Initial release. BAW
B 09/15/2014 Revised EQF, added DO-311A Compliance Qualification
Form and provided additional limitation details (sec 2.5) WVC
C 03/12/2015 Added Environmental Qualification Statement to Section 6. TV
D 03/21/2016 Added Qualifications to Section 1.3. WVC
E 10/30/2018
Updates for MOD 1 function enhancements. Revised
elapsed timer to include countdown timer function. Timer
reset function operates only when timer is stopped.
WVC
F 04/01/2021
Updated style and brand to meet Marketing and
Engineering guidelines. Added -0, -3, -4 and -5 units and
temperature probe information.
Removed reference to -1 version.
DLR

Manual Number 9018205 Revision F, April 1, 2021 4
SECTION 1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The CH93 series, part numbers 6420093-( ), is a multi-function digital clock / chronometer /
voltmeter / temperature unit with multiple options for USB Charging Ports. The unit fits into a
standard, rear-mounted, 2-¼” avionics panel cutout. Power is drawn from the aircraft main bus to
light a white, six digit, seven segment LED clock. The clock can display several different modes:
local time, universal time, flight timers, elapsed and countdown timers and optionally, bus voltage
and up to two temperature inputs. The CH93 display is daylight readable with two methods of
brightness control. It can be controlled automatically using the internal photocell or manually with
an external dimming bus voltage. The CH93 clock has an internal battery to maintain clock time
and flight timer memory when the aircraft is not in use.
The USB Charging Ports are designed as DCPs (Dedicated Charging Ports) to industry-standard
protocol per the USB Battery Charging 1.2 Compliance Plan. Some models also comply with the
higher power requirements of USB Power Delivery 2.0 and 3.0. Early-generation or smaller
consumer electronics typically accept one (1.0) amp during charging. However, newer electronics,
such as tablets and larger devices can accept, and in some cases, require up to 3 amps to charge
and operate. Unlike most dual USB chargers which provide one (1.0) amp on one port and 2.1
amps on the second port, the CH93 provides 3 amps per port. The Type A High Power (HP) USB
ports provide a 5 volt output at 3 amps and the Type C Max Power USB-PD port provides 3 amps
at 5, 9, 15, or 20 volts depending on the type and needs of the device. This provides enough
power to charge any USB device, including the higher demand products. Refer to Section 1.4 for
specific details on charging port configurations for each model. With features like short circuit
protection, over-current protection, low voltage shut-down and temperature monitoring, it handles
abnormal conditions safely.
1.2 PHYSICAL ATTRIBUTES
The CH93 is a single, integrated component contained in a metal enclosure, fitting into a standard
2 ¼” avionics instrument panel cutout. Two types of units are available within the series. Type 1
units have a 4-pin input connector on the rear of the unit for power, external dimming control and
flight timer operation. Type 2 units have a 9-pin D-shell connector that add connections for
temperature probe inputs and a countdown timer external alarm signal. The series includes
versions with and without USB charging ports, located on the front of the unit below the display,
and three control buttons for user interface: Mode, + (plus), and – (minus). The modes are
annunciated with backlit indicators for UTC, Flight, Timer, Volts, and OAT.
Refer to Figures 1.1 and 1.2 for unit dimensions.

Manual Number 9018205 Revision F, April 1, 2021 5
4X 6-32 UNC
1.86
2.39
1.86
2.39
Ø2.25 MAX
0.12
1.15
Photocell
dim adjust
Aircraft
dim adjust
Pin 1
6 digit display
window
Push button
operation (3x)
Dual USB
Charging Ports
Figure 1.1
CH93 Type 1 Drawing (-2 Unit)
1.86
2.39
1.86
2.39
4X 6-32 UNC 6420093-0 6420093-3
6420093-5
1.22
Ø2.25 MAX
Replaceable
Coin Cell (BR2032) Cover
Pin 1
6420093-4
Figure 1.2
CH93 Type 2 Drawing (-0, -3, -4 and -5 Units)

Manual Number 9018205 Revision F, April 1, 2021 6
1.3 MODEL AND PART NUMBER IDENTIFICATION
Chronos Models and Type
Part Number:
6420093-0
6420093-2
6420093-3
6420093-4
6420093-5
Model:
CH93
CH93HP
CH93HP
CH93HP
CH93MAX
Type:
Type 2
Type 1
Type 2
Type 2
Type 2
USB Charging Ports:
None
Dual Type A
Single Type A
Dual Type A
Type A / Type C
Table 1.1
Feature Summary
Feature UTC
Time
Local
Time
Flight
Timers
Elapsed
Timers
Alert
Output
Volts OAT Replaceable
Battery
Type 1 Y Y Y Y N N N N
Type 2 Y Y Y Y Y Y Y Y
Table 1.2
1.4 TECHNICAL SPECIFICATIONS
Electrical Attributes
Input Voltage:
-0,-2,-3,-4:
-5:
10 – 32 VDC
22 – 32 VDC
Input Power:
-0
-2
-3
-4
-5
5 watts max; 0.3 amps @ 14 VDC / 0.15 amps @ 28 VDC
36 watts max; 2.6 amps @ 14 VDC / 1.3 amps @ 28 VDC
21 watts max; 1.5 amps @ 14 VDC / 0.75 amps @ 28 VDC
36 watts max; 2.6 amps @ 14 VDC / 1.3 amps @ 28 VDC
84 watts max; 3.0 amps @ 28 VDC
USB Output Voltage: Type A: 5 VDC ± 0.25 VDC per port
Type C: 5, 9, 15, or 20 VDC ±0.25 VDC per port
(auto-adjustable)
USB Output Power: 3.0 amps max per USB port
(15 watts Type A; 60 watts Type C)
Efficiency: ≈ 90% nominal
Clock Accuracy: ±15 seconds per month
Compatible Temp Probes:
RTD:
Current Sense:
500 Ω Resistor
AD590 Temperature Transducer
Alarm output (Type 2 only): Open drain ground limited to 100mA, max 32 VDC
Table 1.3

Manual Number 9018205 Revision F, April 1, 2021 7
Physical Attributes
Weight: 5.0 ounces (142 g)
Dimensions
(not including connector)
Type 1
Type 2
2.39 inches wide x 2.39 inches high x 1.15 inches deep
(61 mm wide x 61 mm high x 29 mm deep)
2.39 inches wide x 2.39 inches high x 1.22 inches deep
(61 mm wide x 61 mm high x 31 mm deep)
Charging Ports Type
-0:
-2,-3,-4:
-5:
Not Applicable
Type A USB
Type A USB; Type C USB
Clock Digits: 0.360” H x 0.138” W
Connector Kit
Type 1
Type 2
MCIA P/N 9018178
MCIA P/N 9018178-1
Mounting: Rear Panel Mount
Table 1.4
Internal Battery Attributes
Type: Primary (non-rechargeable) coin cell;
poly-carbonmonofluroride lithium
Model:
Type 1
Type 2
BR2330 (factory replaceable only)
BR2032 (field replaceable)
Output Voltage: 3 VDC
Capacity / Energy:
Type 1
Type 2
0.255 Ah / 0.765Wh
0.190 Ah / 0.570Wh
Certification: UL 1642 (see section 2.4)
Table 1.5
Qualifications
Certification FAA TSO-C71
EASA ETSO-C71
Environmental Qualification RTCA/DO-160G (See Section 5.2)
Table 1.6

Manual Number 9018205 Revision F, April 1, 2021 8
SECTION 2 PRE-INSTALLATION CONSIDERATIONS
2.1 COOLING
The CH93 will become warm when in use; however no external cooling is required. This is normal
and within operational parameters. No special mounting considerations are required, although
mounting to a metal surface can help dissipate any heat generated and extend the life of the
product.
2.2 EQUIPMENT LOCATION
The CH93 Digital Clock / USB Charging Port is designed for a circular rear panel mount
configuration, allowing for installation in a cockpit or cabin. Clearance should be provided for the
input mating connector which may require an additional inch of clearance beyond the rear of the
unit.
2.3 ROUTING OF CABLES
Avoid sharp bends in cabling and routing near aircraft control cables. Avoid close proximity and
contact with aircraft structures, avionics equipment or other obstructions that could chafe wires
during flight and cause undesirable effects.
2.4 LIMITATIONS
Environmental qualifications were verified per RTCA DO-160, Revision G in lieu of those identified
within the minimum performance standards (MPS) of the TSO.
The conditions and tests for TSO approval of this article are minimum performance standards.
Those installing this article, on or in a specific type or class of aircraft, must determine that the
aircraft installation conditions are within the TSO standards, specification of the article and
deviations as listed above. TSO articles must have separate approval for installation in an aircraft.
The article may be installed only according to 14 CFR part 43 or the applicable airworthiness
requirements.
Note: Per 8300.16 job aid applicable to airplanes certified under Title 14 of the Code of Federal
Regulations part 25 (Section H. Alterations or Repairs, Element H.7). (Approval is required for)
Changes to designs involving lithium batteries or battery systems except for the following cases:
1. Very small batteries or battery systems (e.g., button/coin cells) not required for safe
operation of the airplane that have less than 2 watt-hours of energy and meet UL
1642,UL 2054 or International Electrotechnical Commission(IEC) 62133.
The battery in the CH93 is non-rechargeable and considered “very small”. It is less than two Watt-
hours and is certified to UL 1642. No STC or coordination with the ACO is required.

Manual Number 9018205 Revision F, April 1, 2021 9
2.5 MODIFICATION
This product has a nameplate that identifies the manufacturer, part number, description,
certification(s) and technical specifications of the unit. It also includes the “MOD” or modification
number representing notable changes in the hardware design of the unit.
Modification (MOD) 0 is the initial release of the product and is identified on the nameplate by the
lack of marking on the MOD numbers 1 through 9 (i.e. 1-9 are visible). All subsequent
modifications are identified on the nameplate by the marking/blacking out of that particular MOD
number (i.e. for MOD 1, the number 1 is not visible and 2-9 are visible - see Figure 2.1 for
examples). MODs do not have to be sequentially inclusive and may be applied independent of
each other.
For additional details regarding specific changes associated with each MOD status refer to the
product published Service Bulletins at www.mcico.com.
Figure 2.1
Nameplate and MOD Status Example
M
O
M
O
MOD 1
& MOD 2