T-39 FLIGHT PREPARATION
= 250 KIAS + 50 KTS (5 x 10)
= 300 KTAS
ANSWER: Lead turn by 1% of TAS or 3NM
IFR PROCEDURAL CALLS
Three calls are performed at each turn point: Two-Minute Prior, Mark-On-Top, and
a. The Two-Minute Prior call is given 2 minutes from the calculated ETA for the
upcoming turn point. If the turn point is estimated at 15 + 30, a two-minute prior call
should be given at 13 + 30. The Two-Minute Prior call includes:
Outbound heading for course.
(2) Estimated time of arrival (ETA) at, and description of navigation to the next
EXAMPLE: "Two Minutes prior to Montgomery; Outbound heading 310° for a course of 315°,
ETA to DELBE is 23 + 45. We're doing a point to point to the Meridian 043° at 87nm."
b. The Mark-On-Top call consists of:
Left/Right XXX (clear turn)
Time (at minimum DME or needle passing the 90° benchmark
Fuel on board
NAVAID (remains the same or switches to next station if on a direct leg)
EXAMPLE: "Left 310°" (at lead point), "Time 15 + 30, Place Montgomery, Fuel 3800#'s,
NAVAID switching to Meridian."
c. The Wings-Level call is initiated when the aircraft is established on an outbound course
from the turn point (navigate prior to TP procedures). The Wings-Level call consists of:
Fuel +/- preflight
Fuel at the IAF
EXAMPLE: "We are 500 lbs above preflight, I estimate 2250 at the initial."
a. Ground speed checks
A manual ground speed check is required on the first leg after level off. Once
accomplished, compare with the aircraft GSP readout. If it is determined to be reliable (+/-
10 kts), the student may use the ground speed readout of the EHSI. Keep in mind, GSP
uses rate of change in DME. Consequently, the following criteria apply for GSP or manual
groundspeed checks to be valid: