Class A Enroute

Question 1

Where does the enroute stage start and end

Answer 1

Starts at 1500ft above the t/o airfield

Ends at 1500ft above the arrival airfield

Question 2

What happens to efficiency cruising at constant mach?

Answer 2

Decreases due to flying at a constant speed while the speed for MRC changes

Question 3

Obstacle clearance for stabilised and un-stabilised flight

Answer 3

Stabilised = 1,000ft clearance min

Un stabilised = req 2,000ft clearance min

Question 4

How much RPM is used in the cruise

Answer 4

90-95%

Question 5

1 eng inop safety factors - class A cruise

Answer 5

2 eng = 1.1%

3 eng = 1.4%

4 eng = 1.6%

Question 6

2 eng inop safety factors - class A cruise

Answer 6

3 eng = 0.3%

4 eng = 0.5%

Question 7

Drift down obstacle clearance

Answer 7

Un-stabilised flight = min 2000ft clearance req

Question 8

Min height above the destination airfield for a drift down

Answer 8

1500ft

Question 9

Drift down req

Answer 9

Eng is assumed to fail at the most critical point on the route

Account must be taken for the effect on wind on the flight path

Fuel jettisoning is allowed

Time to reach diversion = twin a/c - 60min, 3 or more eng - 90min

Question 10

ETOPS

Answer 10

Extended twin operations

Just a number e.g ETOPS at 120 = can be 120mins away from diversion

Req special a/c ( air start APU), training and operating procedures/ req