ALL ATG Page 518 Dec 25/9234-31-00
XA (4) Very the signal generator modulation controls to produce a 2-dot
XA fly-up indication on the captain's HSI. Disconnect No. 1 glide
XA slope antenna (position DB554C at G/S antenna hybrid STA 400, WL
XA 197, LBL 30) cable input. Verify that the glide slope deviation
XA needle returns to the center and that a glide slope flag appears on
XA the HSI.
XA 9. VOR/ILS Switch Test___________________
XA A. As annunciator light is provided adjacent to the VOR/ILS switch which
XA will illuminate one of the following depending on relay position.
XA Captain's 1 XA F/O 2
XA Captain's 3 XA F/O 2
XA Captain's 1 XA F/O 3
)
) Normal
XA NOTE:____Flags appear for a few seconds due to switching delay.
XA 10. Glide Slope Antenna Tuning__________________________
XA A. General
XA (1) This procedure is to be used for antenna tuning in situations when
XA a faulty antenna has been found per trouble shooting procedure
XA 34-31-12 or when a new antenna has been installed.
XA (2) For tuning in laboratory see Overhaul Manual 32-22-55.
XA B. Equipment and Materials
XA (1) Portable VSWR Meter
XA (2) Nose Landing Gear Lock
XA C. Prepare for Tuning
XA CAUTION:_______
XA
XA
XA
XA
TUNING MUST BE PERFORMED WITH:
-NOSE LANDING GEAR FORWARD DOORS CLOSED
-ALL ANTENNA CAVITY ACCESS DOOR SCREWS IN PLACE AND TIGHT
-ZONE WITHIN 5 FEET IN FRONT OF ANTENNA FREE OF METALLICOBJECTS
XA (1) Install nose gear door locks.
XA WARNING:_______ REFER TO 32-00-30 FOR LOCK INSTALLATION PROCEDURE - RAPID
XA ACTION OF DOORS MAY INJURE PERSONNEL OR DAMAGE EQUIPMENT
XA IF LOCKS ARE NOT PROPERLY INSTALLED.
XA (2) Open junction box J28 or J29 in nose gear wheel well.
XA (3) Install VSWR meter on a ladder so that it can be connected to
XA coaxial connector B3203 P or B3205 P. Connect VSWR meter to a
XA 115/220 Volts 50/60 Hz source.
XA D. Antenna Tuning
XA (1) Set VSWR meter frequency control to 332 MHz and calibrate VSWR
XA indicator.
EFFECTIVITY
ALL ATG Page 519 Dec 25/8734-31-00
XA (2) Adjust antenna tuning capacitor for minimum VSWR - Record VSWR.
XA (3) Repeat steps (1) and (2) for 329 and 335 MHz.
XA (4) Verify that:
XA - VSWR recorded in steps (1) (2) (3) do not exceed 6 : 1.
XA - Difference between VSWR at 329 MHz and 335 MHz does not exceed
XA 0.5. If not repeat steps (1) thru (4).
EFFECTIVITY
ALL 02 Page 520 Dec 25/8734-31-00
VHF NAV CONTROL PANEL - REMOVAL/INSTALLATION
____________________________________________
1. General
_______
A. The VHF NAV control panels are located on each side of the AP/FD mode select panel. Each panel is held in place by four fasteners.
CAUTION: THE VHF NAV CONTROL PANEL CONTAINS ELECTROSTATIC DISCHARGE
_______ SENSITIVE DEVICES. REFER TO CHAPTER 20-41-02 FOR HANDLING INSTRUCTIONS TO PREVENT DAMAGE TO THESE DEVICES.
2. Referenced Procedures
_____________________
A. 24-22-00, Maintenance Practices (Apply Power)
3. Remove VHF NAV Control Panel
____________________________
A. On AF 101-150; SN 301-350; IB 405; AT ALL; AZ ALL and LH ALL, open circuit breakers on overhead circuit breaker panel P7 as follows:
VHF NAV Control Panel Circuit Breaker
No. 1 VOR 1 DC
No. 2 VOR 2 DC
B. On AF 121, 122, 151-199; GN ALL; MD ALL and VM ALL, open circuit breakers on overhead circuit breaker panels P7 and P126 as follows: 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(35)
