A-90-030
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THE APPROPRIATE AIRPLANE AND BRAKE MANUFACTURERS TO VERIFTY, BY CONDUCTING TESTS AND ANALYSES, THAT ALL TURBOJET TRANSPORT CATEGORY AIRPLANES MEET THE MAXIMUM ENERGY REQUIREMENT OF 14 CFR 25.735 (F) FOR WHEEL BRAKE ASSEMBLIES AT THE "MAXIMUM BRAKE WEAR" LIMITS; IF THE REQUIREMENT IS NOT MET, REDUCE THE MAXIMUM KINETIC ENERGY TAKEOFF LIMIT. IN CONDUCTING THIS VERIFICATION, USE DYNAMOMETER BRAKE TEST CURVES FOR DEMONSTRATING ENERGY CAPACITY THAT ARE CONSISTENT WITH RUNWAY-DEMONSTRATED BRAKING FORCES DURING A MAXIMUM KINETIC ENERGY REJECTED TAKEOFF. THE TEST CURVES SHOULD REPLICATE THE BRAKE'S HIGH ENERGY ABSORPTION RATE THAT OCCURS AT THE INITIATION OF A MAXIMUM KINETIC ENERGY REJECTED TAKEOFF. NOTE: THIS RECOMMENDATION SUPERSEDES SAFETY RECOMMENDATION A-88-76.
In plain language (FlightFinder summary)
The Federal Aviation Administration must require airplane and brake manufacturers to test and analyze whether all turbojet transport category airplanes meet the maximum energy requirement in 14 CFR 25.735(f) for wheel brake assemblies at their maximum brake wear limits. If they do not, the FAA must reduce the maximum kinetic energy takeoff limit. The verification must use dynamometer brake test curves that match runway-demonstrated braking forces during a maximum kinetic energy rejected takeoff, replicating the brake's high energy absorption rate at the start of such a takeoff.
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 - Acceptable Alternate Action |
|---|---|
| Mode | Aviation |
| Closed | Feb 10, 1994 |
| 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).