Permanent Inhibition of the Terrain Mode

TASK 34-48-00-810-844-A
Permanent Inhibition of the Terrain Mode

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 34-48-00-810-832-A	Terrain Function Not Available
ESPM 2045110
AMM 33-14-00-710-001	Operational Test of the Lights
AMM 34-48-00-740-002	BITE Test of the GPWS

3. Fault Confirmation
Subtask 34-48-00-740-098-A

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

4. Fault Isolation
Subtask 34-48-00-810-107-A

A. If during the test, the Upper ECAM DU warning NAV TERR DET FAULT without maintenance message is shown:

on the GPWS section of panel 21VU, make sure that the GPWS/TERR pushbutton switch (31WZ) is not pushed (the OFF legend is off)

(1) If the OFF legend of the pushbutton switch is illuminated:

(a) If the fault continues:

(2) If the OFF legend of the pushbutton switch is not illuminated:

do the operational test of the annunciator light test system in the cockpit AMM 33-14-00-710-001

(a) If the OFF legend of the pushbutton switch comes on:

(b) If the OFF legend of the pushbutton switch does not come on:

Subtask 34-48-00-740-099-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:17 UTC