SEC 3 Fault without any associated maintenance message

TASK 27-94-00-810-903-A
SEC 3 Fault without any associated maintenance message

1. Possible Causes

RELAY-SEC 3 ANN SPLY [41CE3]
wiring of the RLY SEC FAULT signal from the relay to the SEC
SEC-3 [1CE3]
wiring of the DSI 20/5 (SEC 3 FAILED) signals

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 279205
AIPC 27920803
AMM 27-94-00-710-001	Operational Test of the Spoiler Elevator Computer 3 (SEC 3)
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
ASM 279504
ASM 279505
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-94-00-740-177-A

A. Test
(1) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-94-00-810-148-A

A. If the test confirms the fault:

do the operational test of the SEC3 AMM 27-94-00-710-001 to make sure that the SEC3 servoes its associated surfaces.

(1) If the flight controls move according to the SEC3 servoing:
(a) Remove the SEC3 AMM 27-94-34-000-001.
(b) At the SEC3 receptacle, do a check of the resistance between pin AB/12K and pin AE/12A ASM 279205.
1 If the resistance is less than 280 ohms:
a Remove the RELAY-SEC 3 ANN SPLY [41CE3] AIPC 27920803.
b Do a check of the resistance of the relay between pin X1 and X2.

If the resistance is less than 280 Ohms:
. replace the RELAY-SEC 3 ANN SPLY [41CE3] AIPC 27920803
. install the SEC3 AMM 27-94-34-400-001.
If the resistance is between 280 and 400 ohms:
. do a check and repair the wiring of the RLY SEC FAULT signal from the relay to the SEC ASM 279205
. install the relay
. replace the SEC-3 [1CE3] AMM 27-94-34-400-001.

2 If the resistance is more than 400 ohms:
a Remove the relay (41CE3).
b Do a check of the resistance of the relay between pin X1 and X2.

If the resistance is more than 400 ohms:
. replace the RELAY-SEC 3 ANN SPLY [41CE3] AIPC 27920803.
. install the SEC 3 AMM 27-94-34-400-001.
If the resistance is between 280 and 400 ohms:
. do a check and repair the wiring of the RLY SEC FAULT signal from the relay to the SEC ASM 279205
. install the relay
. install the SEC 3 AMM 27-94-34-400-001.

3 If the resistance is between 280 and 400 ohms:
a Remove the RELAY-SEC 3 ANN SPLY (41CE3) AIPC 27920803.

if the warning SEC3 stays, install the relay AIPC 27920803 and see Para. b_.
if the warning SEC3 goes off, replace the RELAY-SEC 3 ANN SPLY [41CE3] AIPC 27920803
install the SEC 3 AMM 27-94-34-400-001.

b Do a check and repair the wiring of the DSI 20/5 (SEC 3 FAILED) signals from the FCDC1 (3CE1) and the FCDC2 (3CE2) to the RELAY-SEC 3 ANN SPLY (41CE3) ASM 279504 and ASM 279505.
c Install the SEC 3 AMM 27-94-34-400-001.

Subtask 27-94-00-740-178-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:20 UTC