Loss of the Pitch Change Over Signal by the SEC2

TASK 27-93-00-810-918-A
Loss of the Pitch Change Over Signal by the SEC2

1. Possible Causes

SEC-2 [1CE2]
SEC-1 [1CE1]
wiring of the PITCH NOT AVAIL IN ELAC2 (DSI10 and DSI26) signals
wiring of the PITCH NOT AVAIL IN ELAC1 (DSI11 and DSI22) signals
wiring of the L ELEV NOT AVAIL IN SEC1 (DSI13 and DSI27) signals
wiring of the R ELEV NOT AVAIL IN SEC1 (DSI15 and DSI23) signals
wiring of the L ELEV NOT AVAIL IN SEC2 (DSI05) signal
wiring of the R ELEV NOT AVAIL IN SEC2 (DSI06) signal

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-32-00-810-932-A	Failure of the Discrete Links
ASM 279232
ASM 279233
ASM 279234
ASM 279235
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)

3. Fault Confirmation
Subtask 27-93-00-740-182-A

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

4. Fault Isolation
Subtask 27-93-00-810-170-A

A. If the BITE test gives the maintenance message CHECK PITCH CHANGE OVER OF SEC2:

replace the SEC-2 [1CE2] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

(1) If the fault continues:
(a) replace the SEC-1 [1CE1] AMM 27-94-34-000-001 AMM 27-94-34-400-001.
(2) If the fault continues:
(a) do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-932) to the DSI 11 and DSI 22 discret input signal of the SEC 1 COM and MON ASM 279232.
(3) If the fault continues:
(a) Do a check of the wiring of the PITCH NOT AVAIL IN ELAC2 (DSI10 and DSI26) signals from the SEC2 (1CE2) COM part and MON part to the first terminal block ASM 279232:

if there is continuity, see Para. (b)
if there is no continuity, repair the above wiring.

(b) Do a check of the wiring of the PITCH NOT AVAIL IN ELAC1 (DSI11 and DSI22) signals from the SEC2 (1CE2) COM part and MON part to the first terminal block ASM 279233:

if there is continuity, see Para. (c)
if there is no continuity, repair the above wiring.

(c) Do a check of the wiring of the L ELEV NOT AVAIL IN SEC1 (DSI13 and DSI27) signals from the SEC2 (1CE2) COM part and MON part to the first terminal block ASM 279235:

if there is continuity, see Para. (d)
if there is no continuity, repair the above wiring.

(d) Do a check of the wiring of the R ELEV NOT AVAIL IN SEC1 (DSI15 and DSI23) signals from the SEC2 (1CE2) COM part and MON part to the first terminal block ASM 279235:

if there is continuity, see Para. (e)
if there is no continuity, repair the above wiring.

(e) Do a check of the wiring of the L ELEV NOT AVAIL IN SEC2 (DSI05) signal from the SEC2 (1CE2) COM part and MON part to the first terminal block ASM 279234:

if there is continuity, see Para. (f)
if there is no continuity, repair the above wiring.

(f) Do a check and repair the wiring of the R ELEV NOT AVAIL IN SEC2 (DSI06) signal from the SEC2 (1CE2) COM part and MON part to the first terminal block ASM 279234.

Subtask 27-93-00-740-183-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:06 UTC