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STUDENT GUIDE
VISUAL NAVIGATION
6.6.2. T-1A/T-39 VNAV Fuel Planning for Stereo Routes
6.6.2.1. A primary purpose of the jet cards produced in VT-4 / VT-10 is to determine mission
completion feasibility. Simply put, "Do we have enough fuel to complete the mission?" In T-34
mission planning the mission was broken up into three segments: departure to low-level entry,
low-level, climb out and return (approach). For T-1A/T-39 VNAV sorties using out of area
routing or non-stereo flight plans, this same breakdown is sufficient. However, for sorties
incorporating two low levels, certain assumptions can be made regarding the portion of flight
between the two low-level routes.
6.6.2.2. For T-1A/T-39 VNAV missions using stereo routing, the most common profile, the fuel
planing profile is broken into five segments: (Figure 6-13)
6.6.2.2.1. Takeoff, departure to entry point of first low-level.
6.6.2.2.2. The first low-level route
6.6.2.2.3. The interim VFR leg.
6.6.2.2.4. The second low-level route
6.6.2.2.5. The IFR return portion
6.6.2.3. T-1 and T-39 fuel figures for climbing and cruising at various altitudes and airspeeds are
provided in Figures 6-14 and 6-15. (Data from these figures may be used to work the problems
in this text, but the In-flight Guide is the only approved source for flight computations.) The
total fuel required to arrive at the initial approach fix is computed by totaling the segments.
Specified IFR
VFR
Altitude to IAF
Specified
Specified
(700 # Fuel
Altitude
IDLE
Altitude
Required)
And TAS
Descent to
Entry Point
Fuel Flow
Takeoff
from In-flight
Guide
TRADR
1800 pph
Second Low
(300 TAS)
Level Route
2
3
4
5
1
IAF
T-1A/T-39 VNAV Fuel Planning Profile - Stereo Routing
Figure 6-13
6-18


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