Communications: electrical – Selective – Having indication or alarm
Patent
1975-10-28
1977-12-06
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
244201, 340 27SS, G08B 2900
Patent
active
040619966
ABSTRACT:
Apparatus for monitoring the operational status of the air delivery and momentum injection subsystems of a Boundary Layer Control (BLC) system of an aircraft, by sensing an air flow parameter in the supply duct supplying air to the BLC manifold is disclosed. The air flow parameter is sensed as a ratio of two discreet pressures [stagnation/static (P.sub.T /P.sub.S) or static/static (P.sub.S1 /P.sub.S2)]. When the ratio falls outside of a predetermined range, an indication that the air delivery and momentum injection subsystem has failed is provided. The failure may be due to either a rupture or a blockage of the air delivery and momentum injection subsystem. A combined BLC status indication is provided by combining the signal related to the sensed air flow parameter with signals related to the correctness of the position of the valves controlling the bleed air flowing to the air delivery momentum and injection subsystem and the position of the high lift surfaces (e.g., flaps) of the aircraft.
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Fadden Delmar M.
Gupta Alankar
Caldwell John W.
Groody James J.
The Boeing Company
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