TM 55-1510-215-10
Section XII. OPERATION ENVELOPE
7-45. Use of Chart.
7-44. Description.
This chart is used to determine if the proposed flight
The Operation Envelope Chart (fig. 7-16), shows
is within the operational temperature/altitude envelope
the maximum and minimum temperatures for which
and to identify the temperature and altitude combinations
operation is recommended; the maximum altitudes
which should be used for flight planning.
possible for both two and single-engine operation; and
identifies the altitude and temperature combinations for
7-46. Conditions.
which Cruise Charts are available. The maximum and
minimum temperature lines are based on International
Service ceilings are based on the aircraft in a clean
Standard Atmosphere (ISA) temperatures plus 37
configuration.
degrees Celsius and minus 30 degrees Celsius,
respectively.
The airframe manufacturer cannot
recommend operation outside of this envelope.
7-34 Change 8
