A-70-041
NTSB Safety Recommendation — Aviation
Recommendation text
1. REVIEW ALL ASSEMBLY RECORDS AND WRITTEN PROCEDURES AS THEY RELATE TO CRITICAL FITS, CLEARANCES, AND DIMENSIONAL CHECKS COVERING THE ASSEMBLY OF AFFECTED TURBINE MODULE ASSEMBLIES REWORKED TO THE LATEST CONFIGURATION. 2. REVIEW ALL INSTALLATION RECORDS COVERING INSTALLATION OF REWORKED TURBINE MODULE ASSEMBLIES RELATIVE TO FITS,CLEARANCES, DIMENSIONAL CHECKS, AND WRITTEN INSTALLATION PROCEDURES.3. EFFECT IMMEDIATE INSPECTION OF ALL JT9D ENGINES WHOSE RECORDS INDICATE QUESTIONABLE FITS, CLEARANCES, INSTALLATION PROCEDURES OR MATERIAL SPECIFICATIONS, AND EFFECT IMMEDIATE REMOVAL FROM SERVICE OF ANY ENGINE WHICH DISCLOSES SUCH DISCREPANCIES."
In plain language (FlightFinder summary)
The FAA is asked to examine all documentation regarding the assembly and installation of specific reworked turbine modules to ensure proper fits and measurements were recorded. If these records show any doubts about quality or compliance, the agency must immediately inspect the affected engines and take them out of service if discrepancies are found. This process aims to verify that critical dimensional checks were correctly followed during maintenance and to remove potentially unsafe engines from operation.
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 | Apr 16, 1971 |
| NTSB number | DCA71IZ001 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).