A-89-030
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: PUBLISH A NOTICE IN THE FEDERAL AVIATION ADMINISTRATION'S ADVISORY CIRCULAR (AC) NO. 43-16, GENERAL AVIATION AIRWORTHINESS ALERTS, CONCERNING THE PROPER INSTALLATION AND INSPECTION OF PROPELLER GOVERNOR OIL LINE ASSEMBLIES. THE NOTICE SHOULD: (A) CITE EXAMPLES OF ACCIDENTS AND/OR INCIDENTS RESULTING FROM IMPROPER INSTALLATION OR INSPECTION OF THIS ASSEMBLY; (B) EMPHASIZE THE IMPORTANCE OF PROPER ALIGNMENT AND TORQUEING OF THE OIL LINE ASSEMBLY TO PREVENT PRE LOADS OR OVERSTRESS; (C) EMPHASIZE THE IMPORTANCE OF PROTECTING THE OIL LINE FROM DAMAGE DURING INSTALLATION OF THE ALTERNATOR ASSEMBLY; AND (D) STRESS THE SIGNIFICANCE OF ATTACHING ALL REQUIRED SUPPORT CLAMPS, CLIPS, AND HOSES THROUGHOUT THE SPAN OF THE OIL LINE TO AVOID EXCESSIVE VIBRATION AND FLEXURE, AND HIGH-CYCLE, LOW-STRESS METAL FATIGUE.
In plain language (FlightFinder summary)
The FAA is asked to publish a notice in its Advisory Circular No. 43-16, General Aviation Airworthiness Alerts, regarding proper installation and inspection of propeller governor oil line assemblies. The notice should cite examples of accidents or incidents from improper installation or inspection, emphasize proper alignment and torqueing to prevent pre loads or overstress, stress protecting the oil line during alternator assembly installation, and highlight the need for all required support clamps, clips, and hoses to avoid excessive vibration, flexure, and high-cycle low-stress metal fatigue.
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 2, 1990 |
| NTSB number | MIA86LA209 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).