A-88-049
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE THAT REQUIRES OPERATORS OF ALL BOEING 747-100 AND -200 AIRPLANES WITH INBOARD AND/OR OUTBOARD FLAP CARRIAGE SPINDLES HAVING MORE THAN 25,000 HOURS OF SERVICE TO PERIODICALLY REMOVE AND INSPECT THE SPINDLE AREAS BENEATH THE BEARING JOURNAL SLEEVES ON ALL INBOARD AND/OR OUTBOARD FLAP CARRIAGE SPINDLES FOR EVIDENCE OF CORROSION AND CRACKING; TO PROPERLY REWORK CORROSION-AFFECTED AREAS OF THE FLAP CARRIAGE SPINDLES; AND TO REINSTALL BEARING JOURNAL SLEEVES ON CRACK FREE FLAP CARRIAGE SPINDLES WITH PROCEDURES THAT WILL ASSURE MAXIMUM CORROSION PROTECTION OF THE SPINDLES.
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to issue an airworthiness directive for Boeing 747-100 and -200 airplanes with inboard and/or outboard flap carriage spindles that have more than 25,000 hours of service. The directive would require periodic removal and inspection of the spindle areas under the bearing journal sleeves for corrosion and cracking, rework of corroded areas, and reinstallation of sleeves on crack-free spindles using procedures that ensure maximum corrosion protection.
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 Action |
|---|---|
| Mode | Aviation |
| Closed | Mar 23, 1990 |
| NTSB number | DCA87RI044 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).