DADE Aircraft Performance & Limitations 3

Question 1

An aircraft dispatcher must ensure that the en route terrain clearance with one engine inoperative allows the aircraft to clear all terrain by at least:

Accepted Answer

1,000 feet within 5 miles of the intended track

Answer

Under 14 CFR Part 121.191, the aircraft must be able to clear all terrain and obstructions by at least 1,000 feet within 5 statute miles on either side of the intended route with one engine inoperative.

Question 2

What is 'VMCA' and how does it affect dispatch decisions?

Accepted Answer

Minimum control speed in the air with critical engine inoperative; must remain below V2 speed

Answer

VMCA is the minimum control speed in the air with the critical engine inoperative, and V2 must be equal to or greater than 1.1 × VMCA to ensure controllability after engine failure during takeoff.

Question 3

When dispatching an aircraft to a high-altitude airport (above 8,000 feet MSL), which performance limitation typically becomes most critical?

Accepted Answer

Runway length due to reduced air density lowering engine thrust and aerodynamic lift

Answer

At high-altitude airports, reduced air density decreases both engine thrust output and aerodynamic lift, requiring higher ground speeds for liftoff and significantly increasing runway length requirements.

Question 4

Under 14 CFR 121.197, what runway length requirement applies for dispatching to an alternate airport for landing?

Accepted Answer

80% of the available runway length

Answer

For alternate airports, 14 CFR 121.197 requires that the landing distance not exceed 80% of the effective runway length, providing a greater margin than the 60% typically applied at the destination.

Question 5

The 'drift down' procedure for ETOPS or extended over-water operations refers to:

Accepted Answer

The one-engine-inoperative cruise altitude capability after an engine failure at optimum altitude

Answer

Drift down is the OEI performance profile showing the aircraft's ability to maintain altitude or descend gradually after an engine failure at cruise altitude while remaining above minimum enroute altitudes.

(DADE) Designated Aircraft Dispatch Examiner Practice Test

(DADE) Designated Aircraft Dispatch Examiner Practice Test

DADE Aircraft Performance & Limitations 3