Genesys GDR- COM Series, Installation Manual, Page: 29 / 62

GDR-XXXX NAV/COM INSTALLATION MANUAL
CHAPTER 2 – SYSTEM INSTALLATION
64-000109 Page 29 of 62
17. MOUNTING
A. Tray Installation
Use the following guidelines in locating and mounting the tray assembly in the aircraft.
See Chapter 3 for tray mechanical dimensions.
•
For normal operation, it is preferred the GDR be mounted in a temperature
controlled environment between -20°C and +55°C.
•
The GDR may be mounted in the pressure vessel. The GDR contains no batteries
or potentially explosive components.
•
The tray assembly may be mounted in the normal (mounting screws down),
inverted, or on its side.
•
The GDR should be located within 20 feet of the NAV display system (EFIS or
HSI) and audio control system.
•
Burnish and apply an electrical bonding agent to the mounting surface area that
will be contacting the mounting tabs of the tray assembly.
•
Install the tray assembly using four (4) 8-32 screws (MS27039-0807) and four (4)
#8 washers (NAS1149F0832P) or equivalent with installer supplied AN, MS, or
NAS nuts, nut clips, or nut plates as required.
•
Use four (4) self-locking nuts (AN365) or equivalent, nut plates, or #8 threaded
inserts to secure the tray assembly to the airframe.
•
Verify resistance between the tray assembly chassis and airframe ground is less
than 2.5 milliohms.
Upon determination of a suitable existing shelf, or completion of a new equipment shelf, a
static load test must be performed per AC 43.13-2A, Chapter1, §2 and §3 to determine
proper load bearing and security of the equipment. A typical aircraft operating in Normal
FAR 23 (CAR 3), Normal FAR 27 (CAR 6), Transport FAR 25 (CAR 4b), or Transport FAR
29 (CAR 7) category will require a test of the shelf as follows:
Fixed Wing Rotorcraft
Direction
of Pull Load
Factor Static Test Load
(Load factor x GDR-
XXXX Weight) Load
Factor Static Test Load
(Load factor x GDR-
XXXX Weight)
Sideways 4.5g (4.5 x 4.5) = 20.2 lbs. 8.0g (8.0 x 4.5) = 36.0 lbs.
Upwards 7.0g (7 x 4.5) = 31.5 lbs. 4.0g (4.0 x 4.5) = 18.0 lbs.
Forwards 18.0g (18 x 4.5) = 81.0 lbs. 16.0g (16.0 x 4.5) = 72.0 lbs.
Downwards 10.0g (10 x 4.5) = 45.0 lbs. 20.0g (20.0 x 4.5) = 90.0 lbs.
Backwards 1.5g (1.5 x 4.5) = 6.8 lbs.
The installer will make a simple test jig that will be used to measure the static test loads as
shown in the table above. Perform the tests at the center of gravity of the GDR-XXXX and
record the completion of the test in the Ground Maintenance section of this manual. An