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 T33337

XA
THIS TABLE IS INTENDED TO GIVE GUIDANCE REGARDING
MINIMUM DISPATCH REQUIREMENT FOR HEADING (COMPASS) SYSTEMS.

CONDITION  INSTRUMENT  MINIMUM REQUIREMENTS 
PILOT STATION "A"  PILOT STATION "B" 
1. FOR IFR CONDITIONS WITH STANDBY MAGNETIC COMPASS OPERATIVE  HSI  MAGNETICALLY SLAVED  STABILIZED ONLY BUT SEPARATE SOURCE FROM PILOT A 
RMI CARD  NOT REQUIRED*  MAGNETICALLY Slaved 
2. FOR IFR OR VFR CONDITIONS WITH STANDBY MAGNETIC COMPASS INOPERATIVE  HSI  MAGNETICALLY SLAVED  MAGNETICALLY SLAVED (SEPARATE SOURCE FROM PILOT A) 
RMI CARD  NOT REQUIRED*  NOT REQUIRED* 
THIRD HEADING SOURCE  A THIRD SOURCE (INS OR DG) MUST BE AVAILABLE FOR SWITCHING TO EITHER HSI 
3. FOR VFR CONDITIONS WITH STANDBY MAGNETIC COMPASS OPERATIVE  HSI  MAGNETICALLY SLAVED  NOT REQUIRED 
RMI CARD  NOT REQUIRED  MAGNETICALLY SLAVED ** + 

OPERATION IN DG OR TRUE HEADING MODE ALLOWED.
* EXCEPT AS MAY BE REQUIRED FOR VOR/ADF USAGE.
+ USE OF OTHER PILOTS' SOURCE (BY APPROPRIATE SWITCHING) IS ALLOWED. ** NOT REQUIRED IF PILOT "B"s HSI IS MAGNETICALLY SLAVED.
B. Procedure
(1)
Placard affected equipment or source-switch position, "INOP".

(2)
Inform dispatch.

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 XA MEL - MAINTENANCE PROCEDURE NO. 34-17 MAGNETIC COMPASS
______________________________________________________ XA XA 1. ____________________________
MAGNETIC COMPASS INOPERATIVE XA A. _______
General XA XA The following procedure is applicable when both compass couplers are XA operative and 3 INS's are operative in ATT mode to permit normal XA aircraft dispatchability as required by the B.747 MEL. XA XA B. _________
Procedure XA (1) Placard the MAGNETIC COMPASS (on top of center post, at the base XA of the Pilot's overhead panel) "INOP". XA (2) Inform dispatch.
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 XA MEL - MAINTENANCE PROCEDURE NO. 34-21 VHF NAVIGATION RECEIVERS
______________________________________________________________ XA XA 1. ________________________
VHF NAVIGATION RECEIVERS XA A. _______
General XA XA The following procedure is applicable when self test of VHF NAV XA RECEIVERS is inoperative, to permit normal aircraft dispatchability as XA required by the B.747 MEL. XA XA B. _________
Procedure XA XA Placard the "TEST" button of the affected system control panel "INOP". XA
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 XA MEL - MAINTENANCE PROCEDURE NO. 34-22 DISTANCE MEASURING EQUIPMENT
__________________________________________________________________ XA XA 1. ____________________________
DISTANCE MEASURING EQUIPMENT XA A. _______
General XA XA The following procedure is applicable when Distance Measuring Equipment XA is inoperative to permit normal aircraft dispatchability as required XA by the B.747 MEL. XA XA B. _________
Procedure XA XA Placard RDMI affected DME window "INOP". XA
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 XA MEL - MAINTENANCE PROCEDURE NO. 34-23 WEATHER RADAR
___________________________________________________ XA XA 1. _____________
WEATHER RADAR XA A. _______
General XA XA The following procedure is applicable when WEATHER RADAR SYSTEM is XA inoperative to permit normal aircraft dispatchability as required by XA the B.747 MEL. XA XA B. _________
Procedure XA (1) Install a placard "INOP" close to the transfer switch on the XA control panel. Left if system 1 is inop. Right if system 2 is XA inop. In the center if both systems are inop. XA (2) Install a placard "INOP" on affected indicator.
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 XA MEL - MAINTENANCE PROCEDURE NO. 34-24 RADIO COMPASS (ADF)
_________________________________________________________ XA XA 1. _____________
RADIO COMPASS (ADF) XA A. _______
General XA XA The following procedure is applicable when Radio Compass System is XA inoperative to permit normal aircrafr dispatchability as required by XA the B.747 MEL. XA XA B. _________
Procedure XA XA Placard affected system control panel "INOP". XA
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