Different Total Pressure on the Three ADIRUs
1. Possible Causes
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- PROBE-PITOT, 1 (9DA1)
- PROBE-PITOT, 2 (9DA2)
- PROBE-PITOT, 3 (9DA3)
- ADM-L TOTAL PRESSURE (19FP1)
- ADM-R TOTAL PRESSURE (19FP2)
- ADM-STBY TOTAL PRESSURE (19FP3)
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific ARINC Reader
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 34-10-00-170-001 Flushing of the Principal Total Pressure Lines AMM 34-10-00-170-003 Draining and Flushing of Standby Pneumatic Circuits AMM 34-10-00-860-002 ADIRS Start Procedure AMM 34-11-15-000-001 Removal of the Pitot Probe (9DA1, 9DA2, 9DA3) AMM 34-11-15-400-001 Installation of the Pitot Probe (9DA1, 9DA2, 9DA3) AMM 34-11-17-000-001 Removal of the Air Data Module
(19FP1,19FP2,19FP3,19FP4,19FP5,19FP6, 19FP7,19FP8) AMM 34-11-17-400-001 Installation of the Air Data Module (19FP1,19FP2,19FP3,19FP4,19FP5,19FP6, 19FP7,19FP8) AMM 34-13-00-790-002 Leak Test of the Principal Static and Total Air Data System ASM 34-13/01
3. Fault Confirmation
__________________
A. Test
Not applicable, you cannot confirm this fault on the ground.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 106-149, 204-299, 301-399, ∞∞34-11-00∞∞∞∞∞∞∞∞∞∞Page 245
401-499, Aug 01/05 CES
4. Fault Isolation
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A. If the POST FLIGHT REPORT gives the maintenance message ADM1 (19FP1)/ADM2 (19FP2)/ ADM3 (19FP3):
- do a visual check of the PROBE-PITOT, 1 (9DA1), PROBE-PITOT, 2 (9DA2) and PROBE-PITOT, 3 (9DA3).
(1) If one pitot probe is damaged:
- replace the defective pitot probe (Ref. AMM TASK 34-11-15-000-001) and (Ref. AMM TASK 34-11-15-400-001).
(2) If the pitot probes are not damaged:
- do the ADIRS start procedure (Ref. AMM TASK 34-10-00-860-002)
- connect the ARINC Reader to the test connector 198VC on the panel 188VU and to the test connector 199VC on the panel 187VU (Ref. ASM 34-13/01)
- compare the total pressure read on these labels:
(a) If the value of the total pressure (ADM 1, ADM 2 or ADM 3) is different:
- replace the defective total pressure ADM (Ref. AMM TASK 34-11-17-000-001) and (Ref. AMM TASK 34-11-17-400-001).
(b) If the values are the same:
- do the flushing of the total pressure line of the air data module (ADM 1 and ADM 2) (Ref. AMM TASK 34-10-00-170-001)
- do the draining and flushing of the standby static and standby total pressure line of the air data module (Ref. AMM TASK 34-10-00-170-003)
- do the leak test of the main air data system (CAPT and F/O) (Ref. AMM TASK 34-13-00-790-002).
ADIRU 1 199VC | 19FP1 LABEL 242
pins GG, HH |
|
ADIRU 2 198VC | 19FP2 LABEL 242
pins GG, HH |
|
ADIRU 3 199VC | 19FP3 LABEL 242
pins y, z |
B. After the subsequent flight, if the fault continues:
- replace the ADM-L TOTAL PRESSURE (19FP1) (Ref. AMM TASK 34-11-17-000-001) and (Ref. AMM TASK 34-11-17-400-001).
C. After the subsequent flight, if the fault continues:
- replace the ADM-R TOTAL PRESSURE (19FP2) (Ref. AMM TASK 34-11-17-000-001) and (Ref. AMM TASK 34-11-17-400-001).
D. After the subsequent flight, if the fault continues:
- replace the ADM-STBY TOTAL PRESSURE (19FP3) (Ref. AMM TASK 34-11-17-000-001) and (Ref. AMM TASK 34-11-17-400-001).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 106-149, 204-299, 301-399, ∞∞34-11-00∞∞∞∞∞∞∞∞∞∞Page 246
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