737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔离手册 导航(80)

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AMM TASK 34-57-03-400-801. c) Re-install the RMI. To install it, do this task: Radio Magnetic Indicator (RMI) Installation, AMM TASK 34-22-01-400-801. d) If the ADF flag does not show on the right side of the RMI, then you corrected the fault. 5) If you do not find a problem with wiring, then do these steps: a) Re-install the ADF receiver 2. To install it, do this task: ADF Receiver Installation, AMM TASK 34-57-03-400-801. b) Install a new RMI. To install it, do this task: Radio Magnetic Indicator (RMI) Installation, AMM TASK 34-22-01-400-801.
EFFECTIVITY SIL ALL  34-22 TASK 803 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 206 Jun 10/2006 

 

-------------------------END OF TASK ---------------------------801. Standby Magnetic Compass Error -Fault Isolation
EFFECTIVITY SIL ALL  34-22 TASK 803 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 207 Jun 10/2006 

 

A.  Description
(1)  This task is for this observered fault:
(a) The standby magnetic compass indicates an incorrect magnetic heading.
B.  Possible Causes
(1) Standby magnetic compass, N74.
C.  Initial Evaluation
(1)  
Make sure the air data inertial reference system is aligned and in the NAV mode.

(2)  
Do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(a)  If there is a maintenance message that relates to the ADIRU internal fault, then go to the FIM task for that message.

(3)  
If the magnetic heading on the standby magnetic compass is different more than ± 8 degrees (FAA certification) or ± 5 degrees (CAA certification) of the magnetic heading on the EHSI display, then do the Fault Isolation Procedure below.

D.  Fault Isolation Procedure
(1)  
Do the standby magnetic compass calibration (AMM TASK 34-23-00-820-802 or AMM TASK 34-23-00-820-801).

(a)  
If the standby magnetic compass heading agrees with the magnetic heading on the EHSI, then you corrected the fault.

(b)  
If the standby magnetic compass heading does not agree with the magnetic heading on the EHSI, then continue.

 

(2)
Replace the standby magnetic compass.
These are the tasks:
Standby Magnetic Compass Removal, AMM TASK 34-23-01-000-801,
Standby Magnetic Compass Installation, AMM TASK 34-23-01-400-801.

 

(a)  If the test in the installation task for the standby magnetic compass is satisfactory, then you corrected the fault.
-------------------------END OF TASK ---------------------------
802. Standby Magnetic Compass Light Not Illuminated
A.  Description
(1)  This task is for this observed fault:
(a)  The standby magnetic compass light not illuminate.
B.  Possible Causes
(1)
Standby magnetic light

(2)
Wiring

C.  Related Data
(1)  WDM 33-14-12
EFFECTIVITY

34-23 TASKS 801-802
SIL ALL
Page 201 D633A103-SIL Feb 15/2009

D.  Initial Evaluation
(1)  Set the compass light switch to ON and then to BRIGHT.
(a)  
Make sure the standby magnetic compass light is on and bright.

(b)  
If the standby magnetic compass light is on and bright, then there was an intermittent fault.

(c)  
If the standby magnetic compass light is not on and bright, then do the Fault Isolation Procedure below.

E.  Fault Isolation Procedure
(1)
Replace the standby magnetic compass light.
These are the tasks:
Standby Magnetic Compass Light -Removal, AMM TASK 34-23-01-000-802,
　
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