# Proposed AD FAA-2010-0632: Robert E. Rust, Jr. Model DeHavilland DH.C1 Chipmunk 21, DH.C1 Chipmunk 22, and DH.C1 Chipmunk 22A Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-18-12
- Products: Robert E. Rust, Jr.
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 21, 2010, 75 FR 34956
- Comments due: August 5, 2010
- Became: [AD 2010-18-12](https://openairdocs.org/ad/2010-18-12)
- Docket: FAA-2010-0632 (https://www.regulations.gov/docket/FAA-2010-0632, where comments are filed)
- Project: 2010-CE-025-AD
- FR document: 2010-14989
- Official PDF: https://openairdocs.org/files/sha256/ac/ca/acca69507bf2320ec5b252c1b7e19154c69876e1737ff3da397e305ef2794d99 (from https://www.govinfo.gov/content/pkg/FR-2010-06-21/pdf/2010-14989.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/06/21/2010-14989/airworthiness-directives-robert-e-rust-jr-model-dehavilland-dhc1-chipmunk-21-dhc1-chipmunk-22-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CA8931D4DBA2081686257749005BB2DB.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0632

## Summary

We propose to adopt a new airworthiness directive (AD) for all Robert E. Rust, Jr. Model DeHavilland DH.C1 Chipmunk 21, DH.C1 Chipmunk 22, and DH.C1 Chipmunk 22A airplanes. This proposed AD would require a one-time inspection of the flap operating system for an unauthorized latch plate design installation. This proposed AD results from a report of a latch plate failing in service that was not made in accordance with the applicable de Havilland drawing. We are proposing this AD to detect and correct unauthorized latch plate design installation, which could result in an un-commanded retraction of the flaps. This failure could lead to a stall during a landing approach.

## Notices in this docket

- Jun 21, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-14989, comments due Aug 5, 2010 (https://www.federalregister.gov/documents/2010/06/21/2010-14989/airworthiness-directives-robert-e-rust-jr-model-dehavilland-dhc1-chipmunk-21-dhc1-chipmunk-22-and)

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