A-90-032
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THE APPROPRIATE AIRPLANE MANUFACTURERS TO DETERMINE BY TESTS, SIMULATION, AND/OR ANALYSES THE ACCELERATE-STOP DISTANCES FOR ALL TURBOJET TRANSPORT CATEGORY AIRPLANES CURRENTLY IN SERVICE AS REQUIRED BY 14 CFR 25.109 (PRE-ADMENDMENT 42) USING DEMONSRATED CERTIFICATION STOPPING PERFORMANCE DATA FROM WORN BRAKES AND CURRENT PROCEDURES PRESCRIBED FOR REJECTED TAKEOFFS. ACCOUNT FOR DEMONSTRATED PILOT REACTION TIMES AND FOR DECELERATION DEVICE REACTION TIMES, SUACH AS ENGINE SPOOL-DOWN TIME AND BRAKE FORCE RAMP-UP TIME IN THE DETERMINATION OF ACCELERATE STOP DISTANCES AND ADD A DISTANCE SAFETY MARGIN FOR IN SERVICE VARIATIONS AS DESCRIBED IN ADVISORY CIRCULAR 25-7 (CHAPTER 2, PARAGRAPHS 11.C.12.IV AND VII) TO BE EQUIVALENT TO AT LEAST A DISTANCE TRAVELED IN 2 SECONDS AT AN APPROPRIATE BRAKE-ON SPEED OR V1 SPEED.
In plain language (FlightFinder summary)
The NTSB asks the FAA to require airplane manufacturers to calculate accelerate-stop distances for all in-service turbojet transport airplanes using worn brakes and current rejected takeoff procedures. These calculations must account for pilot and deceleration device reaction times and include a safety margin equivalent to at least two seconds of travel at the brake-on or V1 speed.
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 | Feb 24, 1995 |
| NTSB number | FTW88NA106 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).