# Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
> **Rule** · Final rule; request for comments. · Published 2016-09-08 · Effective 2016-09-23 · 81 FR 61987
## Document
- **Document number:** 2016-21155
- **Category:** airworthiness
- **Manufacturer:** Gulfstream Aerospace Corporation
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 81 FR 61987
- **Publication date:** 2016-09-08
- **Effective date:** 2016-09-23
- **FAA docket:** Docket No. FAA-2016-9070
## Abstract

We are adopting a new airworthiness directive (AD) for all Gulfstream Aerospace Corporation Model G-1159, G-1159A, G-1159B, G-IV, and GV airplanes; and certain Model GIV-X and GV-SP airplanes. This AD requires a one-time replacement of the actuator end cap fitting of the main landing gear (MLG) door, and revision of the maintenance or inspection program to establish the life limit of the end cap fitting. This AD was prompted by a report of the failure of the right MLG to extend due to fatigue cracking of the end cap fitting. We are issuing this AD to prevent such cracking, which could result in depletion of the combined (left) and utility hydraulic system fluid and the nitrogen emergency blowdown system, failure of the combined (left) hydraulic system (all phases) to provide adequate hydraulic pressure, and failure of the MLG to extend when commanded.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/09/08/2016-21155/airworthiness-directives-gulfstream-aerospace-corporation-airplanes)
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