A-81-106
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THAT DC-9-80 LANDING-APPROVED SIMULATORS INCORPORATE ACTUAL AIRCRAFT CHARACTERISTICS INCLUDING THE DECREASE IN VERTICAL STABILIZER AND RUDDER CONTROL EFFECTIVENESS AS A FUNCTION OF ENGINE REVERSE THRUST LEVELS. THE FLIGHT TEST DATA USED SHOULD BE TAKEN FROM MCDONNELL DOUGLAS REPORT MDC-J9005. FIGURE 14, YAWING ACCELERATION DUE TO MAXIMUM RUDDER, POWER ON, AND FIGURE 15, YAWING ACCELERATION DUE TO MAXIMUM RUDDER, MANUAL, SHOULD BE USED FOR SYMMETRIC REVERSER CONFIGURATIONS FOR THRUST VALUES FROM FORWARD IDLE TO 1.3 EPR REVERSE. DATA SIMILAR TO THAT IN FIGURE 71, EFFECT OF REVERSE THRUST ON DIRECTIONAL CONTROL, SHOULD BE DERIVED AND USED FOR ALL SPEEDS AND SYMMETRIC REVERSE THRUST SETTINGS. CONTROL EFFECTIVENESS FROM A SYMMETRIC 1.3 EPR TO A SYMMETRIC 1.6 EPR SHOULD DECREASE TO ZERO. FOR ASYMMETRIC REVERSE THRUST CONDITIONS, THE DATA IN FIGURE 20, CONTROLLABILITY WITH ASYMMETRIC REVERSE THRUST, SHOULD BE USED.
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to require that DC-9-80 landing-approved simulators include actual aircraft characteristics, specifically the reduction in vertical stabilizer and rudder effectiveness that occurs with increasing engine reverse thrust. The recommended data sources are figures from McDonnell Douglas report MDC-J9005, covering symmetric and asymmetric reverse thrust conditions.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Unacceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Oct 3, 1988 |
| NTSB number | LAX80FA111 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).