Installation of the Standby Horizon Indicator

TASK 34-22-24-400-001-A
Installation of the Standby Horizon Indicator

ZONE: 211
FIN: 7FN ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
211	COCKPIT

B. Referenced Information

REFERENCE	DESIGNATION
TASK 33-13-00-710-001-A	Operational Test of the Instrument and Panel Integral-Lighting
Standby Horizon Indicator

3. Job Set-up
Subtask 34-22-24-865-054-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/STBY/HORIZON	5FN	F12
122VU	LIGHTING/INSTL LT/MAIN INST/PNL AND/PED	4LF	Y04

4. Procedure
Subtask 34-22-24-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Standby Horizon Indicator (7FN)
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the electrical connectors (4) and (5).
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Connect the electrical connector (5) to the standby horizon indicator (3).
(6) Install the standby horizon indicator (3) in its housing.
(7) Tighten the two screws (2).

Subtask 34-22-24-865-053-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/STBY/HORIZON	5FN	F12
122VU	LIGHTING/INSTL LT/MAIN INST/PNL AND/PED	4LF	Y04

Subtask 34-22-24-710-050-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do the operational test of the instrument and panel integral lighting
(Ref. AMM TASK 33-13-00-710-001).
(2) Make sure that the flag is out of view.
(3) One minute and 30 seconds after the energization, pull the resetting knob until the horizon line is stable. Release the knob rapidly.
(4) Make sure that the roll index reads zero.
(5) Make sure that the horizon line is stable and in line with the aircraft symbol.

5. Close-up
Subtask 34-22-24-410-050-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Install the thermoformed cover on the center instrument panel.
(2) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.02 06:23:15 UTC