N91- 11696 'J

FLIGHT GUIDANCE RESEARCH FOR RECOVERY FROM

MICROBURST WIND SHEAR

David A. Hinton

NASA, Langley Research Center

Hampton, Virginia 23665

ABSTRACT

Research is in progress to develop flight strategy

concepts for avoidance and recovery from microburst wind

shears. The objectives of this study are to evaluate the

performance of various strategies for recovery from wind shear

encountered during the approach-to-landing, examine the

associated piloting factors, and evaluate the payoff of

forward-look sensing. Both batch and piloted simulations are

utilized. The industry-recommended manual recovery technique

is used as a baseline strategy. Two advanced strategies were

selected for the piloted tests. The first strategy emulates

the recovery characteristics shown by prior optimal trajectory

analysis, by initially tracking the glideslope, then

commanding a shallow climb. The second strategy generates a

flight path angle schedule that is a function of airplane

energy state and the instantaneous shear strength. All three

strategies are tested with reactive sensing only and with

forward-look sensing.

Piloted simulation tests are in progress. Tentative

results indicate that, using only reactive alerts, there

appears to be little difference in performance between the

various strategies. With forward-look alerts, the advanced

guidance strategies appear to have advantages over the

baseline strategy. Relatively short forward-look alert times,

on the order of 10 or 15 seconds, produce a far greater

recovery benefit than optimizing a recovery from a reactivealert.

395

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