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 1.  General
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 A.  Five antenna switches are located behind the VOR/ILS receivers on shelves E1-2 and E1-3 of the main equipment center. Each switch is secured to the mounting structure by screws and has provisions for connecting three coaxial cables and one electrical cable connector.
 2.  Referenced Procedures
_____________________
 A.  25-51-00, Flight Interphone System - Adjustment/Test
 B.  24-22-00, Maintenance Practices (Apply Power)
 3.  Remove Antenna Switch
_____________________
 A.  On LH 001-010; AF 101-120, 123-150; AZ 201-220; IB 405; and SN 301-350, open circuit breaker(s) on overhead circuit breaker panel P7 as follows:
 Antenna Switch______________ Circuit Breaker 1 VOR 1 DC 2 VOR 2 DC 3 VOR 1 DC AND VOR 2 DC 4 CAPT FLT INST SW RELAYS 5 CAPT FLT INST SW RELAYS
 B.  On LH 011-099; AF 121, 122, 151-199; GN ALL; MD ALL; and VM ALL, open circuit breaker(s) on overhead circuit breaker panels P7 and P126 as follows:
 Antenna Switch______________ P7 CB_____ P126 CB 1 VOR 1 DC 2 VOR 2 DC 3 VOR 1 DC AND VOR 2 DC VOR 3 4 CAPT FLT INST SW RELAYS 5 CAPT FLT INST SW RELAYS
 C.  On AZ 221-299; SN 351-399; IB 406-499; and AT ALL, open circuit breaker(s) on overhead circuit breaker panel P7 as follows:
 Antenna Switch______________ Circuit Breaker 1 VOR 1 DC 2 VOR 2 DC 3 VOR 1 DC AND VOR 2 DC 4 CAPT FLT INST SW RELAYS 5 F/O FLT INST SW RELAYS
 CAUTION: THE ANTENNA SWITCH CONNECTOR J1 IS A TYPE N MALE COAXIAL
_______ CONNECTOR. WHEN FACING THE CONNECTOR SIDE OF THE ANTENNA SWITCH, THE KNURLED BARREL FOR CONNECTOR J1 IS ROTATED CW TO LOOSEN AND CCW TO TIGHTEN.
 D.  Disconnect four cable connectors from antenna switch.
 E.  Remove four screws and remove antenna switch.
 4.  Install Antenna Switch
______________________
 A.  Place antenna switch in position and install four screws.
 B.  Connect cable connectors to antenna switch.
 C.  Close circuit breaker(s) opened in paragraph 3.A. above.
 D.  Test antenna switch for satisfactory operation as follows:
 (1)
Provide electrical power (Ref 24-22-00).

 (2)
Position mode selector on AP/FD MSP to HDG.

 EFFECTIVITY
 
 ALL  18 Page 401  Sep 25/9434-31-07
 (3)
 Turn on applicable VOR/ILS navigation system.

 (4)  
Position captain's VOR/ILS transfer switch to normal when testing antenna switches No. 1, No. 2, No. 4 or No. 5 and to alternate (aux receiver selected) when testing antenna switch No. 3.

 (5)  
Tune VOR/ILS navigation system No. 1 (when testing antenna switch No. 1, No. 3 or No. 4) or system No. 2 (when testing antenna switch No. 2 or No. 5) to local VOR station. Listen for station identification code on flight interphone.

 (6)  
Return captain's VOR/ILS transfer switch to normal position.

 (7)  
Turn off VOR/ILS navigation system.

 (8)  
Remove electrical power if no longer required (Ref 24-22-00).

 EFFECTIVITY

 
 ALL  07 Page 402  Apr 25/8634-31-07
 VOR/ILS TRANSFER SWITCH - REMOVAL/INSTALLATION
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 1.  General
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 A.  On all ATLAS except AT 701-799, three transfer switches for the VOR/ILS navigation system are installed on the pilot's lightshield and instrument panels. One VOR/ILS transfer switch is on the captain's instrument panel while the two VOR/ILS-INS transfer switches are on the lightshield panel. On AT 701-799, five VOR/ILS transfer switches for the VOR/ILS navigation system are installed on the pilot's lightshield and instrument panels. Two of the transfer switches are on the captains' instrument panel while the first officer's panel has only one VOR/ILS (DEV) transfer switch. The two VOR/ILS-INS transfer switches are on the lightshield panel.
 2.  Referenced Procedures
_____________________
 A.  24-22-00, Maintenance Practices (Apply Power)
 3.  Remove VOR/ILS Transfer Switch
______________________________
 A.  Open applicable CAPT or F/O FLT INST SW RELAYS circuit breaker on overhead circuit breaker panel P7.
 B.  Remove switch mounting hardware.
 C.  Disconnect electrical connections and remove switch.
 4.  Install VOR/ILS Transfer Switch
_______________________________
 A.  Connect electrical leads to switch.
 B.  Position switch in mounting and secure by installing mounting hardware.
　
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