TABLE 401
A. Position unit in mounting taking care to engage guide pins for proper mating of electrical connector.
B. Engage and tighten knurled clamp nut.
C. Close circuit breaker(s) opened in paragraph 3 above.
D. Test receiver/transmitter for satisfactory operation as follows:
(1) Provide electrical power (Ref 24-22-00).
E. On AF, AT, GN, MD, VM airplanes, turn on LRRA system at appropriate height indicator.
F. On AZ ALL, LH 004-099, SN 351-399 and IB 406-499, for LRRA system 3, check that LRRA-3 fault annunciator on center instrument panel displays a valid (black) indication.
EFFECTIVITY
ALL 06 Page 402 Dec 25/8734-33-02
(1)
On AF, AT, GN, MD, VM airplanes, turn off LRRA system.
(2)
Perform LRRA system operational tests (A/T section, Chapter 34-33-( )).
(3)
Remove electrical power if no longer required (Ref 24-22-00).
EFFECTIVITY
ALL 08 Page 403 Apr 25/8534-33-02
LRRA ANTENNAS - REMOVAL/INSTALLATION
____________________________________
1. General
_______
A. The LRRA antennas are installed in the wing-to-body fairing panel on the underside of the airplane. All antennas are identical.
2. Equipment and Materials
_______________________
A. Bonding Meter
B. Coating - Alodine, MIL-C-5541, Type II, Grade C, Class 1
C. Compound - Corrosion Inhibiting, BMS 3-27
D. Gloves, neoprene or rubber - Commercially available
E. Goggles - Commercially available
F. Primer - BMS 10-79, Type III
G. Respirator - Commercially available
H. Sealant - Aerodynamic, BMS 5-95, Class B 1/2
I. Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
3. Referenced Procedures
_____________________
A. AMM 24-22-00/201, Maintenance Practices (Apply Power)
B. AMM 51-21-04/701, Alodine Coating - Cleaning/Painting
C. AMM 51-31-01/201, Seals and Sealing
D. SWPM 20-20-00, Electrical Bonding and Grounding
4. Remove LRRA Antenna (Fig. 401)
___________________
A. Open ALTM LOW R1 and R2 circuit breakers on circuit breaker panel P7.
B. On LH 051-070, IB 406-499, open circuit breaker ALTM LOW R3 on circuit breaker panel P126.
C. Remove eight screws holding antenna to mounting ring.
D. Lower antenna until coaxial connector(s) accessible.
E. Remove lockwire installed between antenna connector(s) and coaxial cable connector(s), then disconnect cable from connector on antenna. Mark connectors to assure correct installation later.
5. Install LRRA Antenna (Fig. 401)
____________________
A. Clean the mating surfaces of the airplane structure and the antenna:
(1) Clean the airplane surface and antenna with solvent, Series 88 (Ref AMM/SOPM 20-30-88).
B. Apply a layer of alodine to the airplane and antenna mating surfaces.
C. Apply one very thin coat of BMS 3-27 (Mastinox) for corrosion prevention to the antenna baseplate.
NOTE: Make sure that the BMS 3-27 is very thin, because it is non conductive.
D. Connect coaxial cable(s) to antenna. Tighten and lockwire, as required.
E. Position antenna in mounting recess. Check that keying pin on antenna mates with keying pin hole in mounting ring.
F. Install seven of eight steel screws holding antenna to mounting ring and
tighten. XA On ALL EXCEPT AF airplanes, check that pointers (FWD/AFT) on the XA antenna show into the longitudinal axis of the airplane (Fig. 401) XA (AEB AF 34-249).
G. Disconnect antenna coaxial cable from R/T unit.
EFFECTIVITY
ALL ATG Page 401 Apr 25/9834-33-03
.................... .XA
TRANSMIT ANT NO. 3
5 RECEIVE ANT NO. 3
5
TRANSMIT ANT NO. 2
TRANSMIT ANT NO. 1
RECEIVE
RECEIVE ANT NO. 1
ANT NO. 2
1
KEYING PIN INDEX HOLE FAIRING PANEL
COUPLING CABLE CONNECTOR 2 TRANSMISSION CABLE CONNECTOR
6
1 A APPLICABLE TO AIRPLANE BSEE OR , AS CONFIGURATION, FOR ELECTRICAL BONDING PATH FROM ANTENNA TO FAIRING PANEL TRANSMISSION CABLE CONNECTOR CONNECTOR DELAY LINE SCREW (8 PLACES) TRANSMISSION CABLE CONNECTOR
2 SN ALL
3 4 5 AZ, IB, LH ALL AF, AT, GN, MD ALL ANTENNAS INSTALLED ON COVERPLATES INSTALLED ON LH 051-070 AND IB 406-499. ALL EXCEPT LH 051-070 4 3
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航2(78)
