INSTRUMENTS FLIGHT PLANNING
TWO-MINUTE PRIOR CALL
The TWO-MINUTE PRIOR Call is given two minutes prior to reaching any NAVAID or any
specific turnpoint designated by your route of flight. In order to determine the TWO-MINUTE
PRIOR point, you must constantly be aware of your position along the route of flight.
To determine when you are two-minutes prior to a NAVAID or turnpoint, simply subtract two
minutes from your ETA for the NAVAID or turnpoint.
There are two bits of information that the pilot requires at the TWO-MINUTE PRIOR point:
Outbound heading for course.
ETA at the next checkpoint.
At the TWO-MINUTE PRIOR point, and in preparation for the MARK-ON-TOP Call, note your
fuel on board and fuel flow. These readings are important because at the MARK-ON-TOP, you
are required to give the pilot the aircraft's fuel state.
So that you do not have to shift your attention from the MARK-ON-TOP Call, it is
recommended that you predict your MARK-ON-TOP fuel in the following manner:
Note the fuel on board.
Note your fuel flow.
Convert fuel flow to pounds per minute.
Multiply the pounds per minute fuel flow times two.
Subtract the product from the fuel on board.
Let us look at a sample TWO-MINUTE PRIOR Call for the flight from NAS Pensacola to
Tyndall AFB shown in Figure 4-2.
Given: 15,000 MSL, Flying from CEW to MAI, GS = 210
DME = 35 to MAI
Crab angle: MAI - BRITS 3L
When is your TWO-MINUTE PRIOR point?
GS = 3.5 NM/Min.
ETE to MAI is 10 minutes (35 DME 3.5 NM/Min).
ETA = actual clock time + ETE to MAI (50+00 plus 10 = 00+00).
The TWO-MINUTE PRIOR point is 00+00 minus 2 = 58+00.
4-2 TWO-MINUTE PRIOR, MARK-ON-TOP AND WINGS LEVEL CALLS