Internal Failure of the ISIS Indicator

TASK 34-22-00-810-807-A
Internal Failure of the ISIS Indicator

1. Possible Causes

IND-ISIS [22FN]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-20-00-710-802	ISIS Reset
AMM 34-22-25-000-001	Removal of the ISIS Indicator
AMM 34-22-25-400-001	Installation of the ISIS Indicator
ISIS Indicator - OUT OF ORDER Display

3. Fault Confirmation
Subtask 34-22-00-700-053-A ** ON A/C NOT FOR ALL

A. Test
Not applicable, you cannot confirm this fault on the ground.

4. Fault Isolation
Subtask 34-22-00-810-067-B ** ON A/C NOT FOR ALL

A. If the fault message OUT OF ORDER with fault code made up as follows xxxx xxxx x1xx is shown, it is not necessary to remove the ISIS indicator,

do a reset of the ISIS Indicator AMM 34-20-00-710-802
ISIS Indicator - OUT OF ORDER Display ** ON A/C NOT FOR ALL

Subtask 34-22-00-810-071-A ** ON A/C NOT FOR ALL

B. If the fault message OUT OF ORDER with fault code made up as follows 82xx xxxx xxxx is shown:

replace the IND-ISIS [22FN] AMM 34-22-25-000-001 and AMM 34-22-25-400-001.

Subtask 34-22-00-810-058-A ** ON A/C NOT FOR ALL

C. If the fault symptom is identified by the maintenance message on the face of the ISIS indicator:
ISIS(22FN-10FC)
and by the OUT OF ORDER message on the face of the ISIS indicator:

replace the IND-ISIS [22FN] AMM 34-22-25-000-001 AMM 34-22-25-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:32:55 UTC