Engine 1 Differental Pressure Transducer Drift Measurement

TASK 36-11-00-810-A19-A
Engine 1 Differental Pressure Transducer Drift Measurement

1. Possible Causes

XDCR-BLEED DIFFERENTIAL PRESS, ENG1 [18HA1]
sense line

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 36-11-00-740-805	Drift Test of the Pressure Sensor
AMM 36-11-18-000-801	Removal of the Bleed Differential Pressure-Transducer
AMM 36-11-18-400-801	Installation of the Bleed Differential Pressure-Transducer
AMM 36-11-49-000-826	Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Upstream) and the Bleed Differential Pressure-Transducer
AMM 36-11-49-400-826	Installation of the Sense Line between the Bleed-Air Precooler Exchanger (Upstream) and the Bleed Differential Pressure-Transducer
AMM 36-12-00-860-802	Pressurization of the Bleed System with the APU
AMM 36-12-00-860-803	Pressurization of the Bleed System through the HP Ground Connector
AMM 36-22-00-790-802	Leak Check on all the Bleed Air Ducts and Packs Components

3. Fault Confirmation
Subtask 36-11-00-740-113-A ** ON A/C NOT FOR ALL

A. Test
(1) Pressurize the Bleed Air System AMM 36-12-00-860-802 or AMM 36-12-00-860-803
(2) Do the Pressure Sensor Drift Test AMM 36-11-00-740-805

4. Fault Isolation
Subtask 36-11-00-810-459-A ** ON A/C NOT FOR ALL

A. If the test shows the maintenance message:
DRIFT DIFF-PRESS XDCR (18HA1)/ SENSE LINE
(1) Replace the XDCR-BLEED DIFFERENTIAL PRESS, ENG1 [18HA1] AMM 36-11-18-000-801 and AMM 36-11-18-400-801.
(2) Do the test given in Para. 3.

Subtask 36-11-00-810-460-A ** ON A/C NOT FOR ALL

B. If the fault continues:
(1) Replace the sense line of the bleed differential pressure-transducer AMM 36-11-49-000-826 and AMM 36-11-49-400-826.
(2) Do a leak check of the sense line AMM 36-22-00-790-802.

Subtask 36-11-00-710-649-A ** ON A/C NOT FOR ALL

C. Test
(1) After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:33:56 UTC