Loss of the Left Throttle Lever Transducer Signal for the SEC 3

TASK 27-60-00-810-805-A
Loss of the Left Throttle Lever Transducer Signal for the SEC 3

1. Possible Causes

SEC-3 [1CE3]
CTL UNIT-THROTTLE, ENG 1 [8KS1]
wiring of the VS and SPLY signals from the SEC3 (1CE3) to the throttle control unit (8KS1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
ASM 279220
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AMM 76-11-19-000-040	Removal of the Throttle Control Unit
AMM 76-11-19-400-040	Installation of the Throttle Control Unit

3. Fault Confirmation
Subtask 27-60-00-860-131-A

A. Job Set-Up
(1) Energize the aircraft electrical circuits AMM 24-41-00-861-002.
(2) On the overhead panel 24VU:

(3) On the overhead panel 24VU:

(4) On the central pedestal 11VU:

Subtask 27-60-00-700-058-A

B. Test
(1) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-60-00-810-054-E ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message:
SEC3 OR INPUT OF L THROTTLE CTL UNIT 8KS1

(1) If the fault continues:

replace the CTL UNIT-THROTTLE, ENG 1 [8KS1] , AMM 76-11-19-000-040 and AMM 76-11-19-400-040.

(2) If the fault continues:

do a check and repair the wiring of the VS and SPLY signals from the SEC3 (1CE3) to the throttle control unit (8KS1) ASM 279220.

Subtask 27-60-00-700-059-A

B. Do the BITE test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:42 UTC