# Proposed AD 94-NM-107-AD: British Aerospace Model ATP Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 95-19-06
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: May 9, 1995, 60 FR 24589
- Comments due: June 1, 1995
- Became: [AD 95-19-06](https://openairdocs.org/ad/95-19-06)
- Docket: 94-NM-107-AD
- FR document: 95-11356
- Official PDF: https://openairdocs.org/files/sha256/c3/6d/c36d54d971abbf8aa47b5ccc588766f15a5b1d40384d517c1b319aa78e9fb5b2 (from https://www.govinfo.gov/content/pkg/FR-1995-05-09/pdf/95-11356.pdf)
- Federal Register: https://www.federalregister.gov/documents/1995/05/09/95-11356/airworthiness-directives-british-aerospace-model-atp-airplanes
- Page: https://openairdocs.org/proposed/94-NM-107-AD

## Summary

This document revises an earlier proposed airworthiness directive (AD), which would have superseded an existing AD that is applicable to all British Aerospace Model ATP airplanes. The existing AD currently requires inspections to detect cracking of the aft end of the wing rib boom angles on the left and right engine, and repair or replacement of the wing rib boom angle assemblies, if necessary. The existing AD was prompted by the detection of cracks in the engine outboard rib boom angles at the main landing gear (MLG) actuator attachment point. Its required actions are intended to prevent structural failure of the actuator attachment point, which could lead to collapse of the MLG. The previously proposed action would have limited the applicability of the rule to certain airplanes; revised the initial inspection threshold for certain modified airplanes; and would have required that modified boom angles be installed whenever replacement is necessary. This action revises the proposed rule by correcting the actions necessary to be accomplished for one specific type of cracking condition.

## Notices in this docket

- Jan 18, 1995: Notice of proposed rulemaking (NPRM). (first notice), FR document 95-1131, comments due Feb 22, 1995 (https://www.federalregister.gov/documents/1995/01/18/95-1131/airworthiness-directives-british-aerospace-model-atp-series-airplanes)
- May 9, 1995: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 95-11356, comments due Jun 1, 1995 (https://www.federalregister.gov/documents/1995/05/09/95-11356/airworthiness-directives-british-aerospace-model-atp-airplanes)

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