Failure of the tachometer drives on the left gear

TASK 32-42-00-810-940-A
Failure of the tachometer drives on the left gear

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-42-00-720-002	Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON
ASM 324202
AMM 32-42-57-000-001	Removal of the Tachometer
AMM 32-42-57-400-001	Installation of the Tachometer
AMM 32-42-68-000-003	Removal of the MLG Tachometer-Drive
AMM 32-42-68-400-003	Installation of the MLG Tachometer-Drive

3. Fault Confirmation
Subtask 32-42-00-720-078-A

A. Test
(1) Do the functional test of the tachometers AMM 32-42-00-720-002.

4. Fault Isolation
Subtask 32-42-00-810-226-A

A. If the test confirms the fault:

(1) If the tachometer drives are damaged:

replace the DRIVE ASSY-TACHOMETER,WHEEL 1 [2681GM] and DRIVE ASSY-TACHOMETER,WHEEL 2 [2680GM] AMM 32-42-68-000-003 AMM 32-42-68-400-003

(2) If the tachometer drives are not damaged:

replace the TACHOMETER-WHEEL 1 [19GG] and TACHOMETER-WHEEL 2 [21GG] AMM 32-42-57-000-001 AMM 32-42-57-400-001

(3) If the fault continues:

do a check and repair the wiring from the tachometers to the BSCU (10GG). ASM 324202

Subtask 32-42-00-720-079-A ** ON A/C NOT FOR ALL

B. Do the functional test given in Para.3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:31:39 UTC