CSAS Pressure Sensor Fault

TASK 21-58-00-810-806-A
CSAS Pressure Sensor Fault

1. Possible Causes

SENSOR-PRESS,CSAS [117HW]
wiring
ASM [1YM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 215301
AMM 21-58-00-710-001	Operational Test of the Conditioned Service Air System without Bleed Air
AMM 21-58-00-710-002	Operational Test of the Conditioned Service Air System with Bleed Air
AMM 21-58-12-000-001	Removal of the Pressure Sensor
AMM 21-58-12-400-001	Installation of the Pressure Sensor
AMM 34-10-00-860-002	ADIRS Start Procedure
AMM 47-10-43-920-001	Air Separator Module Replacement

3. Fault Confirmation
Subtask 21-58-00-710-060-A ** ON A/C NOT FOR ALL

A. Test
(1) Make sure that the ADIRU is activated AMM 34-10-00-860-002.
(2) Do the operational test of the conditioned service air system without bleed air AMM 21-58-00-710-001.
(3) Do the operational test of the conditioned service air system with bleed air AMM 21-58-00-710-002.

4. Fault Isolation
Subtask 21-58-00-810-086-A ** ON A/C NOT FOR ALL

A. If the system test without bleed gives a different maintenance message, do the related trouble shooting procedure.

Subtask 21-58-00-810-071-A ** ON A/C NOT FOR ALL

B. If the system test with bleed gives the maintenance message CSAS PRESS SNSR (117HW):

replace the SENSOR-PRESS,CSAS [117HW] AMM 21-58-12-000-001 and AMM 21-58-12-400-001.

(1) If the fault continues:

do a check and repair the wiring from:
the CSAS PRESSURE SENSOR (117HW) the CSAS CONTROL UNIT (100HW) and,
the CSAS PRESSURE SENSOR (117HW) to ground ASM 215301.

(2) If the fault continues:

replace the ASM [1YM] AMM 47-10-43-920-001.

Subtask 21-58-00-810-055-A ** ON A/C NOT FOR ALL

C. If the system test with bleed gives a different maintenance message, do the related trouble shooting procedure.

Subtask 21-58-00-710-061-A ** ON A/C NOT FOR ALL

D. Do the test as given in the Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:24:49 UTC