# Proposed AD 2000-CE-64-AD: Robert E. Rust Models DeHavilland DH.C1 Chipmunk 21, 22, and 22A Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-17-16
- Products: Rust, Robert E.
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); Reopening of the comment period.
- Published: April 16, 2003, 68 FR 18571
- Comments due: June 23, 2003
- Became: [AD 2003-17-16](https://openairdocs.org/ad/2003-17-16)
- Docket: 2000-CE-64-AD
- FR document: 03-9304
- Official PDF: https://openairdocs.org/files/sha256/19/84/1984b9c99432d193d6b6b911e043d71b65a6c5db05bcb8e0c529168eeddb643a (from https://www.govinfo.gov/content/pkg/FR-2003-04-16/pdf/03-9304.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/04/16/03-9304/airworthiness-directives-robert-e-rust-models-dehavilland-dhc1-chipmunk-21-22-and-22a-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F6D0A0EAF8FAA17685256D0A00524CFC.0001
- Page: https://openairdocs.org/proposed/2000-CE-64-AD

## Summary

This document proposes to revise an earlier proposed airworthiness directive (AD) that would apply to certain Robert E. Rust (R.E. Rust) Models DeHavilland DH.C1 Chipmunk 21, 22, and 22A airplanes. The earlier NPRM would have required you to repetitively inspect the tailplane attachment brackets and replace each bracket. The earlier NPRM would have also required you to repetitively inspect each joint of the port and starboard engine mount frame and the rear upper mount frame tubes for cracks and/or damage and repair any cracks and/or damage found. The earlier NPRM resulted from reports of stress corrosion cracking found on the tailplane attachment brackets and fatigue cracking and chaffing of the engine mount frame. We incorrectly referenced replacing the tailplane attachment brackets (part number C1.TP.167) upon accumulating 9,984 hours time-in-service (TIS). The hour limitation should be 9,984 fatigue hours. Fatigue hours are hours TIS multiplied by the role factor (operational use) as defined in the manufacturer's service information. This proposed supplemental NPRM also adds an hour limitation for performing the repetitive inspection of the tailplane 1 attachment brackets. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these additional actions.

## Notices in this docket

- Nov 12, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-28617, comments due Jan 17, 2003 (https://www.federalregister.gov/documents/2002/11/12/02-28617/airworthiness-directives-robert-e-rust-models-dehavilland-dhc1-chipmunk-21-22-and-22a-airplanes)
- Apr 16, 2003: Supplemental notice of proposed rulemaking (NPRM); Reopening of the comment period., FR document 03-9304, comments due Jun 23, 2003 (https://www.federalregister.gov/documents/2003/04/16/03-9304/airworthiness-directives-robert-e-rust-models-dehavilland-dhc1-chipmunk-21-22-and-22a-airplanes)

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