# Proposed AD 2000-NM-181-AD: Bombardier Model DHC-7-100, -101, -102, and -103 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-08-05
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 12, 2000, 65 FR 60595
- Comments due: November 13, 2000
- Became: [AD 2001-08-05](https://openairdocs.org/ad/2001-08-05)
- Docket: 2000-NM-181-AD
- FR document: 00-26093
- Official PDF: https://openairdocs.org/files/sha256/ee/70/ee70b2f4a7f36538ba715b75a8b81c566d087fabebf7347e529fefb7d85c9ca7 (from https://www.govinfo.gov/content/pkg/FR-2000-10-12/pdf/00-26093.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/10/12/00-26093/airworthiness-directives-bombardier-model-dhc-7-100--101--102-and--103-series-airplanes
- Page: https://openairdocs.org/proposed/2000-NM-181-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Bombardier Model DHC-7- 100, -101, -102, and -103 series airplanes. This proposal would require inspecting the endcaps of the main landing gear selector valve for leaks of hydraulic oil and, if leaks are detected, replacing the leaking endcaps or the entire selector valve. This proposal would also require eventual replacement or rework of certain selector valves, which would terminate the repetitive inspections. This action is prompted by a report of the collapse of the main landing gear due to an external leak of hydraulic oil in the landing gear selector valve, resulting from a fracture of the endcap. This action is intended to prevent leaks of hydraulic oil from the main landing gear selector valve, which could result in the collapse of the main landing gear.

## Notices in this docket

- Oct 12, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-26093, comments due Nov 13, 2000 (https://www.federalregister.gov/documents/2000/10/12/00-26093/airworthiness-directives-bombardier-model-dhc-7-100--101--102-and--103-series-airplanes)

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