(c)
If the alternate pitot or alternate static system has a leak, then do these steps: 1) Repair the leak. 2) Do this task: Integrated Standby Flight Display -System Test, AMM
TASK 34-24-02-730-801. a) If the operational test is satisfactory and all of the conditions in the Initial Evaluation are not true, then you corrected the fault.
-------------------------END OF TASK ---------------------------
814. Integrated Standby Flight Display -Attitude Display Difference With No Flag -Fault Isolation
A. Description
(1) The attitude shown on the integrated standby flight display following takeoff is different from the known attitude, and no flag is displayed.
B. Possible Causes
(1) Movement of the airplane has occured during the power up and automatic alignment of the integrated standby flight display, N226.
NOTE: The ISFD alignment occurs automatically when the ISFD is powered up, and is indicated by the ATT and INIT 90s messages.
C. Circuit Breakers
(1) This is the primary circuit breaker related to the fault:
CAPT Electrical System Panel, P18-2
Row Col Number Name
D 8 C01551 ISFD
D. Related Data
(1)
(SSM 34-24-15).
(2)
(WDM 34-24-15).
EFFECTIVITY
34-24 TASKS 813-814
SIL ALL
Page 213 D633A103-SIL Jun 15/2008
E. Initial Evaluation
(1)
Make sure that this circuit breaker is closed:
CAPT Electrical System Panel, P18-2
Row Col Number Name
D 8 C01551 ISFD
(2)
For a reported incorrect attitude shown on the integrated standby flight display while in flight, and no flag displayed, do the Fault Isolation Procedure below.
F. Fault Isolation Procedure
CAUTION: DO NOT MOVE THE AIRPLANE WHILE THE ISFD SHOWS THE YELLOW "ATT" AND "INIT90S" MESSAGES. IF YOU MOVE THE AIRPLANE DURING THE ISFD SYSTEM POWER-UP AND INITIALIZATION ALIGNMENT, THE ISFD MAY DISPLAY INCORRECT ATTITUDE INFORMATION WITH NO ATT FLAG OR MESSAGE.
(1) Do an electrical power cycle of the integrated standby flight display by using one of these procedures:
SIL 001-004, 006, 007, 009-013, 016-019, 021, 101
(a) Operate the circuit breaker on the front of the ISFD dedicated battery charger, M2100, E1-3: 1) Open the DBC Output breaker 2) Close the DBC Output breaker
SIL 005, 008, 014, 015, 020, 102-999
(b) Operate the circuit breaker on the front of the ISFD dedicated battery charger, M2100, E4-1: 1) Open the DBC Output breaker 2) Close the DBC Output breaker
SIL ALL
(c) Operate the ISFD circuit breaker and the battery switch:
1) Open this circuit breaker:
CAPT Electrical System Panel, P18-2
Row Col Number Name
D 8 C01551 ISFD
2) Open the S5 battery switch on panel P5-13, electrical meter module. 3) Close the S5 battery switch on panel P5-13, electrical meter module. 4) Close this circuit breaker:
CAPT Electrical System Panel, P18-2
Row Col Number Name
D 8 C01551 ISFD
(d) Cycle electrical power.
These are the tasks:
Remove Electrical Power, AMM TASK 24-22-00-860-812,
Supply Electrical Power, AMM TASK 24-22-00-860-811.
EFFECTIVITY SIL ALL 34-24 TASK 814
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 214 Jun 15/2010
(2)
If the next flight reports incorrect attitude shown on the integrated standby flight display while in flight, and no flag displayed, replace the integrated standby flight display. These are the tasks:
Integrated Standby Flight Display Removal, AMM TASK 34-24-02-000-801, Integrated Standby Flight Display Installation, AMM TASK 34-24-02-400-801. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔离手册 导航(89)
