# Proposed AD 2001-NM-221-AD: Boeing Model 737-100, -200, and -200C Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-24-33
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 23, 2001, 66 FR 38217
- Comments due: September 6, 2001
- Became: [AD 2001-24-33](https://openairdocs.org/ad/2001-24-33)
- Docket: 2001-NM-221-AD
- FR document: 01-17605
- Official PDF: https://openairdocs.org/files/sha256/84/92/8492fbcbb600f3052001f6e5ffd7ff5bac9e39e27f8d12bdb264a4660068815a (from https://www.govinfo.gov/content/pkg/FR-2001-07-23/pdf/01-17605.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/07/23/01-17605/airworthiness-directives-boeing-model-737-100--200-and--200c-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/84C47EC54384DB6586256A96005C5CB6.0001
- Page: https://openairdocs.org/proposed/2001-NM-221-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-100, -200, and -200C series airplanes. This proposal would require a one-time inspection for damage (i.e., chafing) of the power feeder wire bundle for the auxiliary power unit (APU) generator and the first officer's elevator down control cable and for proper separation between that wire bundle and control cable, and corrective action, if necessary. For certain airplanes, this proposal also would require attaching the power feeder wire bundle to adjacent wire bundles. This action is necessary to prevent a short circuit and resultant arcing between the wire bundle and control cable, which could sever the control cable. Failure of the first officer's elevator down control cable, if combined with a subsequent failure of the captain's elevator down control cable, could result in loss of elevator control of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Jul 23, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-17605, comments due Sep 6, 2001 (https://www.federalregister.gov/documents/2001/07/23/01-17605/airworthiness-directives-boeing-model-737-100--200-and--200c-series-airplanes)

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