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An aircraft flying at FL370 on MNPS Airspace is unable to continue flight in accordance with its air traffic control clearance (degradation of navigational performance requirements, mechanics troubles etc), but is able to maintain its assigned level (FL370), and due to a total loss of communications capability, could not obtain a revised clearance from ATC. The aircraft should leave its assigned route or track by turning 30° to the right or left whenever this is possible, and the subsequent action will be, turn to acquire and maintain in either direction a track laterally separated by 5 NM from its assigned route and climb:
  • A
    or descent 1 000 ft or descend 500 ft.
  • B
    500 ft or descend 1 000 ft.
  • C
    or descent 1 000 ft.
  • D
    or descend 500 ft.

NORTH ATLANTIC MNPS OPERATIONS MANUAL
CHAPTER 13 SPECIAL PROCEDURES FOR IN-FLIGHT CONTINGENCIES

13.2.1 If an aircraft is unable to continue the flight in accordance with its ATC clearance, a revised clearance shall be obtained, whenever possible, prior to initiating any action. If prior clearance cannot be obtained, the following contingency procedures should be employed until a revised clearance is received:

a) leave the cleared route or track by initially turning at least 30 degrees to the right or to the left, in order to intercept and maintain a parallel, same direction track or route offset 9.3 km (5.0 NM). The direction of the turn should be based on one or more of the following:

1)aircraft position relative to any organized track or route system,
2)the direction of flights and flight levels allocated on adjacent tracks,
3)the direction to an alternate airport;
4)any strategic lateral offset being flown and,
5)terrain clearance

13.3 ACTIONS TO BE TAKEN ONCE OFFSET FROM TRACK
If possible maintain the assigned flight level until established on the 9.3 km (5.0 NM) parallel, same direction track or route offset. If unable, initially minimize the rate of descent to the extent that is operationally feasible. 13.3.2 Once established on a parallel, same direction track or route offset by 9.3 km (5.0 NM), either:

a) descend below FL 290, and establish a 150 m (500 ft) vertical offset from those flight levels normally used, then proceed as required by the operational situation or if an ATC clearance has been obtained, proceed in accordance with the clearance; or
b) establish a 150 m (500 ft) vertical offset (or 300 m (1000 ft) vertical offset if above FL 410) from those flight levels normally used, and proceed as required by the operational situation, or if an ATC clearance has been obtained, proceed in accordance with the clearance.

Note: This question has been updated in the scope of LO 071.01.03.03.49 and NORTH ATLANTIC OPERATIONS AND AIRSPACE MANUAL. Please give us feedback if you come across this question in exam.

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