(b)
Do this task: Alternate Static System Low-range Leak Test, AMM TASK 34-11-00-790-808.
(c)
If the alternate pitot or alternate static systems have 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 SPD flag does not show on the integrated standby flight display, then you have corrected the fault. b) If the SPD message shows on the integrated standby flight display, then continue.
EFFECTIVITY
34-24 TASKS 811-812
SIL ALL
Page 211 D633A103-SIL Jun 15/2008
(d) If the alternate pitot and alternate static systems do not have any leaks, then continue.
(2) Replace the integrated standby flight display, N226. 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.
(a) Do this task: Integrated Standby Flight Display -System Test, AMM TASK 34-24-02-730-801.
1) If the SPD flag does not show, then you corrected the fault.
-------------------------END OF TASK ---------------------------
813. Altitude Difference Between Integrated Standby Flight Display and Common Display System -Fault Isolation
A. Description
(1) Altitude indications are different between the integrated standby flight display (ISFD) and the common display system (CDS).
B. Possible Causes
(1)
Integrated standby flight display, N226.
(2)
Alternate pitot system.
(3)
Alternate static system.
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).
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)
Maintenance action is required for reports of altitude differences between the ISFD and the CDS, if all of the following conditions are true:
(a)
The altitude in the report is greater than 10,000 feet (3048 meters).
(b)
The Mach number in the report is greater than 0.4 Mach.
(c)
The difference in altitude between the ISFD and the CDS is more than 400 feet (122 meters).
(3)
If all of the conditions above are true, then do the Fault Isolation Procedure below.
EFFECTIVITY
34-24 TASKS 812-813
SIL ALL
Page 212 D633A103-SIL Jun 15/2008
F. Fault Isolation Procedure
(1)
Replace the integrated standby flight display, N226. 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.
(a)
If the installation task for the integrated standby flight display is satisfactory and all of the conditions in the Initial Evaluation are not true, then you corrected the fault.
(b)
If all of the conditions in the Initial Evaluation above are true, then continue.
(2)
Do a leak test of the alternate pitot and static systems:
(a)
Do this task: Alternate Pitot System Leak Test, AMM TASK 34-11-00-790-812.
(b)
Do this task: Alternate Static System Low-range Leak Test, AMM TASK 34-11-00-790-808.
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