Observe that rising runway display in ADI is retracted from view, and rising runway flag is in view. IF -
T34454
EFFECTIVITY
CONFIG 2
AF ALL; SN 351-399; MD ALL;
799 Page 102
GN ALL; AT ALL; VM ALL
Apr 25/88
34-33-00
OK
With TEST button still held in, set DH index on height indicator to 70 feet.
VM AIRPLANES;
Verify presence of audio tone in headset or interphone speaker.
IF -
EFFECTIVITYAF 101-120,123-156,158-160,
CONFIG 2 162-182,185-199; SN 351-399; 799 Page 103MD ALL; GN ALL; AT ALL; VM ALL Sep 25/94
34-33-00
4. _________________
LRRA System No. 3
Prepare system for trouble shooting as described in par. 2. At receiver-transmitter, check for tripped failure warning indicators that cannot be reset. IF -
EFFECTIVITY
CONFIG 2
SN 351-399
799 Page 104
Apr 25/88
34-33-00
OK
Release TEST button. Set DH index on height indicator to zero feet and depress TEST button again. Slowly move DH index in altitude. Verify that DH light on ADI illuminates when DH setting is within |10 feet of displayed test altitude. IF -
OK
System No. 1 or 2 is operative.
E51326
EFFECTIVITY
CONFIG 2
AF 121,122,157,161,183,184
799 Page 105
34-33-00
Sep 25/94
PROCEDURE 1
EFFECTIVITY
CONFIG 2
AF ALL; SN 351-399; MD ALL;
799 Page 106
GN ALL; AT ALL; VM ALL
34-33-00
Sep 25/94
LRRA SYSTEM - TROUBLE SHOOTING
______________________________
1. General
_______
A. The following trouble shooting procedures are based on performance of the system operational test and are presented in tree-type format. The test steps (heavy-line boxes) are connected by shaded arrows to show the OK condition path. When all steps in the OK condition path check out, the system is operable.
B. When a test step does not check out, follow the NOT OK line to the box containing the trouble symptom. Turn to the procedure indicated and continue to follow a single line by analyzing the results of each test step until the required corrective action is determined. Perform the specified corrective action, then repeat the step at which the failure was encountered.
C. All trouble shooting procedures are based on the assumption that wiring is OK and that electrical power is available. If the corrective action in the procedure does not correct the problem, check wiring using the wiring diagram.
D. The trouble shooting procedures of par. 3 are for LRRA systems 1 and
2. Use the captain's instruments and controls to check system No. 1 and the first officer's instruments and controls to check system No.
2.
2. Prepare for Trouble Shooting
____________________________
A. Check that ALTM LOW R1 and R2 circuit breakers on overhead circuit breaker panel P7 are closed.
B. Provide electrical power (Ref 24-22-00, Maintenance Practices [Apply Power]).
C. Operate equipment cooling system (Ref 21-58-00, Adjustment/Test [Operational Test]).
EFFECTIVITY
SN 301-350 CONFIG 3 02 Page 101 Apr 25/8834-33-00
3. _______________________
LRRA Systems No. 1 or 2
Prepare system for trouble shooting as described in par. 2. Observe that height indicator pointer indicates between -3 and -11 feet and that warning flag is out of view. IF -
Push TEST button on height indicator. Observe that height indicator altitude pointer indicates 100 |10 feet and warning flag appears. IF -
____NOTE: Antenna bonding problems usually cause a system to malfunction only
during flight. The usual in-flight indications are intermittent
warning flag and erratic (flickering) altitude pointer operation from
approximately 400 feet altitude to the pointer stow altitude. The sys-
tem will usually self-test properly during flight. On the ground,
warning flag and altitude pointer operation will usually be normal.
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