Incorrect Flaps Signal

TASK 34-48-00-810-810-A
Incorrect Flaps Signal

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

3. Fault Confirmation
Subtask 34-48-00-740-068-C

A. Test
(1) Do the BITE test of the Enhanced GPWS AMM 34-48-00-740-002.

4. Fault Isolation
Subtask 34-48-00-810-060-D

A. If the BITE test gives the maintenance message:
GPWS FLP MODE PB SW (7WZ)X/SFCC (21CV)/GPWC (1WZ)

on the GPWS section of panel 21VU:
. make sure that the GPWS/FLAP MODE pushbutton switch (7WZ) is not pushed (the OFF legend is off).
. make sure that the GPWS/LDG FLAP 3 pushbutton switch (13WZ) is not pushed (the ON legend is off).
on the center pedestal, on the panel 114VU, put the flap and slat control lever in the 0 position
do a check for ground at pin AB/9C of the GPWC (1WZ).

(1) If there is ground:

(2) If there is no ground:

(a) If there is ground:

(b) If there is no ground:

1 If the fault continues:

a If the fault continues:

do a check and repair the wiring of the GPWS/LDG FLAP 3 pushbutton switch (13WZ):
. pin A/B3 to GPWC (1WZ) pin AB/9C
. pin A/B2 to SFCC1 (21CV) pin AB/8B
ASM 344801.

Subtask 34-48-00-740-069-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:14 UTC