Failure of the Rudder Trim Indicator

TASK 22-62-00-810-817-A
Failure of the Rudder Trim Indicator

1. Possible Causes

IND-RUDDER TRIM [17CC]
wiring of the 28VDC signal from the circuit breaker (15CC) to the rudder trim indicator (17CC)
wiring of the ground signal at the rudder trim indicator (17CC)
C/B-AUTO FLT/RUDDER/TRIM/IND [15CC]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-62-00-710-001	Operational Test of the Rudder Trim Function
ASM 226701

3. Fault Confirmation
Subtask 22-62-00-865-052-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	AUTO FLT/RUDDER/TRIM/IND	15CC	M20

Subtask 22-62-00-710-084-A

B. Test
(1) Do the operational test of the rudder trim function AMM 22-62-00-710-001.
(a) If the circuit breaker 15CC is open refer to Para. 4.B.

4. Fault Isolation
Subtask 22-62-00-810-080-A

A. If the circuit breaker 15CC is closed, and if no indication shows in the rudder trim indicator:

(1) If there is 28VDC:

(2) If there is no 28VDC:

do a check of the wiring of the 28VDC signal from the circuit breaker (15CC) to the rudder trim indicator (17CC)
do a check of the wiring of the ground signal at the rudder trim indicator (17CC) pin A/F.
ASM 226701.

(a) If there is no continuity:

(b) If there is continuity:

Subtask 22-62-00-810-081-A

B. If the circuit breaker 15CC is open:

(1) If the circuit breaker 15CC opens again:

(a) If the fault continues:

do a check for a short to ground between the circuit breaker (15CC) and the rudder trim indicator (17CC) ASM 226701.

1 If there is a short to ground:

2 If there is no short to ground:

Subtask 22-62-00-710-085-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:12 UTC