Flight Evaluation of the DEEC Secondary Engine Control Airstart Capability

Johnson, J. Blair and Nelson, Jeff (1983) Flight Evaluation of the DEEC Secondary Engine Control Airstart Capability. Technical Report NASA TM-84910, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

The air-start capability of a secondary engine control (SEC) was tested for a DEEC-equipped F100 engine and installed in an F-15 airplane. Two air-start schedules were tested. The first was referred to as the group I schedule; the second or revised schedule was the group II start schedule. Using the group I start schedule, an airspeed of 300 knots was required to ensure successful 40- and 25-percent SEC-mode air starts. If N2 were less than 40 percent, a stall would occur when the start bleeds closed 40 sec after initiation of the air start. All JFS-assisted air starts were successful with the group I start schedule. For the group II schedule, the time between pressurization and start-bleed closure ranged between 50 and 72 sec depending on altitude. All air starts were successful above 225 knots giving a 75-knot reduction in required airspeed for a successful air start. Spooldown air starts of 40 percent were successful at 200 knots at altitudes up to 10,650 m and at 175 knots at altitudes up to 6100 m. Idle rpm was lower than the desired 65 percent for air starts at higher altitudes and lower airspeeds. All JFS-assisted air starts were successful.

EPrint Type:	NASA Technical Memorandum
Keywords:	Secondary engine control, Airstarts, Digital engine control, F100 engine, F-15 airplane
Subjects:	(01 - 09) Aeronautics: (07) Aircraft Propulsion And Power Aircraft/Project: F-15
ID Code:	593
Deposited On:	03 Febuary 2006
Additional Information:	21 pages.