15.3 Grid Navigation
In the event of any major failure of the FMS the crew could use the last airplane position to plot a track to the desired destination, measure the track and distance and navigate by Mental DR till suitable Navigation Aids are available. At any point on track the true heading/track could be measured while aligning the protractor along the meridian at the place. The True heading/track would change by an amount equal to the meridian convergence at any other place. The crew could also use the formula to calculate the true track/heading at any point .
GRID TRACK= TRUE TRACK + LONG WEST
-LONG EAST
Since the ND displays GRID headings beyond 70° N latitude these could be used to maintain single heading to the destination.
Issue I 28.08.2007 Rev.0
POLAR OPERATIONS MANUAL 极地运行手册
CONTENTS PAGE 0-1
CONTENTS
Contents 0-1 to 0-2
Revision 0-3
List of Controlled Copy Holders 0-4
References 0-5
Policy/Purpose/Approval 0-6
1. Polar, Russia & Far East 1-1
2. Preflight Planning 2-1
3. Non Polar Dispatch 3-1 to 3-2
4. Outside Air Temperature (Oat), Fuel Temperature, Fuel Freeze Values 4-1
5. Flight Deck Preparation 5-1
6. Polar Exposure Suits 6-1 to 6-2
7. Enroute Communications 7-1 to 7-4
8. Company Communications 8-1 to 8-2
9. Route Specifics 9-1 to 9-5
10. Irregular Operations 10-1 to 10-2
11. Russian Procedures 11-1 to 11-8
12. Polar Alternate/Diversion Airports 12-1 to 12-5
13. Inflight Radiation Exposure 13-1 to 13-2
14. Training Requirements 14-1
15. Grid Navigation and Plotting 15-1
16. Minimum Equipment List 16-1
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