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DME SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
GJ ALL EXCEPT B-2509 and B-2510
1. General
A. This section contains an operational test and two system tests of the DME system. The operational test is intended to be used without tools or test equipment for a relatively quick check of the operational status of the system. Special tools and equipment are required for the system tests.
2. Operational Test - DME System
A. Prepare for Test
(1)
Provide electrical power.
(2)
Ensure that following circuit breaker at P18 panel are closed:
DME-1 AC
DME-2 AC
B. Test DME System Operation (No. 1 or No. 2 system)
(1)
Adjust frequency tuning controls for 108.00 MHz.
(2)
On appropriate VHF/NAV control panel, actuate DME self-test. Verify that within a few seconds, DME DISTANCE indicators display 000.0 miles.
3. System Test - Using Collins 475D-1
A. Equipment and Materials
(1) DME Ramp Test Set - Collins 475D-1 (modified for AUTO 5-180/270 feature).
B. Prepare for Test
(1)
Provide electrical power.
(2)
Ensure that following circuit breakers on panel P18 are closed:
DME-1 AC
DME-2 AC
INTERPHONE
(3)
Place DME test set approximately 40 feet from DME antenna. Ensure there are no obstructions between test set and DME antennas. (Run test on line-of-sight basis).
(4)
Calibrate ramp test set as indicated in test set instructions book.
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C. Test DME System
NOTE: Prior to beginning test, ensure the other DME system VHF NAV control panel is tuned to a frequency other than test frequency.
(1)
On test set, position controls as follows:
TR ATTEN DB - 15
Function Selector - AUTO 5-180/270
RANGE 180/270 - 270
(2)
Position switches on VHF NAV control panel as follows:
(a) On GJ ALL EXCEPT B-2504 and B-2505, 1) Function Selector - O'RIDE 2) Left frequency display - 108.00 MHz 3) Right frequency display -108.05 MHz 4) Position TFR switch -108.00: Verify DME indicators display 5 ±0.1 miles; after
approximately 18 seconds, display 270 ±5 miles and track inbound to 263 ±5 miles, then track outbound to 277 ±5 miles; and after approximately 18 seconds, display 5 ±0.1 miles.
NOTE: The above test cycle will repeat as long as function selector switch is in O'RIDE position.
(b) On GJ B-2504 and B-2505, 1) Function Selector - O'RIDE 2) Frequency display -108.00 MHz: Verify DME indicators display 5 ±0.1 miles;
after approximately 18 seconds, display 270 ±5 miles and track inbound to 263 ±5 miles, then track outbound to 277 ±5 miles; and after approximately 18 seconds, display 5 ±0.1 miles.
NOTE: The above test cycle will repeat as long as function selector switch is in O'RIDE position.
(3)
When DME is locked on, verify DME audio output is available at audio selector panel.
(4)
While DME indicators are displaying 5-miles, position DME function selector on VHF NAV control panel to NORM or ON. Verify DME indicators display士 0.1 miles for approximately 18 seconds; then display dashes for approximately 18 seconds more; than again display 5 士0.1 miles.
(5)
On test set, position RANGE switch to 180 and function selector to 180/270. Verify DME indicators display 180+9 miles, track inbound to 173+2 miles and outbound to 187+2 miles.
(6)
Restore airplane and test set to original configuration and remove electrical power if no longer required.
NOTE: The above test cycle will repeat as long as function selector switch is in DME position.
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4. System Test - Using Instrument Flight Research ATC-600A
A. Equipment and Materials
(1) Transponder/DME Test Set - IFR Model ATC-600A
B. Prepare for Test
(1)
Position remote test set antenna approximately 21 inches from DME antenna for system under test. Test set antenna should be approximately same height as the airplane antenna.
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