R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
 4. Procedure_________ 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 
R  Post SB  34-1280 For A/C 213-213,
 (Ref. Fig. 401/TASK 34-22-24-991-001)
 Subtask 34-22-24-020-050
 A. Removal of the Standby Horizon Indicator (7FN)
 CAUTION : IF YOU MOVE THE STANDBY HORIZON INDICATOR WHEN IT IS REMOVED,_______ MAKE SURE THAT YOU FIRST BLOCK THE GYROSCOPE ASSEMBLY WITH THE LOCKING WEDGE (SUPPLIED WITH THE INSTRUMENT).
 (1) To cage the standby horizon indicator: pull knob (1) and insert the locking wedge.
 (2) Loosen the two screws (2). Do not remove them.
 (3) Push the screws (2) to release the standby horizon indicator (3) from the clamp.
 (4) Disengage the standby horizon indicator (3) from its housing.
 (5) Disconnect the electrical connector (5).
 (6) Remove the standby horizon indicator (3).
 (7) Put blanking caps on the disconnected electrical connectors (4) and (5). 

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 Standby Horizon Indicator
 Figure 401/TASK 34-22-24-991-001

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 34-22-24Page 404 1201-220, 1May 01/05 1 1 1CES 1

R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
 TASK 34-22-24-400-001
 Installation of the Standby Horizon Indicator (7FN)
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
33-13-00-710-001  Operational Test of the Instrument and Panel Integral Lighting
 3. Procedure_________ 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 
R  Post SB  34-1280 For A/C 213-213,
 Subtask 34-22-24-865-051
 A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-212, 214-220,
R  49VU STBY/HORIZON  5FN  F12 
R  **ON A/C 213-213, 
R  49VU STBY/INST  5FN  F12 

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R  -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 
R  122VU LIGHTING/INSTL LT/MAIN INST/PNL AND/PED  4LF  Y04 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 
R  Post SB  34-1280 For A/C 213-213,
 Subtask 34-22-24-420-050
 B. Installation of the Standby Horizon Indicator (7FN)
 (1) Clean the component interface and/or the adjacent area.
 (2) Do an inspection of the component interface and/or the adjacent area.
 (3) Remove the blanking caps from the electrical connectors (4) and (5).
 (4) Make sure that the electrical connectors 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
 C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 5FN, 4LF
 Subtask 34-22-24-710-050
 D. Operational Test
 (1) Do the operational test of the instrument and panel integral lighting (Ref. 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. 
　
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