# Proposed AD 96-NM-150-AD: Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-09-14
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 28, 1996, 61 FR 44241
- Comments due: October 24, 1996
- Became: [AD 97-09-14](https://openairdocs.org/ad/97-09-14)
- Docket: 96-NM-150-AD
- FR document: 96-21882
- Official PDF: https://openairdocs.org/files/sha256/9f/a2/9fa2b2b174a25a85cf02c37d19f1d54252128ce1ad882e91eebea3dd7f8d2dcb (from https://www.govinfo.gov/content/pkg/FR-1996-08-28/pdf/96-21882.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/08/28/96-21882/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-series-airplanes
- Page: https://openairdocs.org/proposed/96-NM-150-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Boeing Model 737-100, -200, - 300, -400, and -500 series airplanes. This proposal would require an inspection of the aileron/elevator power control units (PCU's) and the rudder PCU to determine if reworked PCU manifold cylinder bores containing chrome plating are installed, and replacement of the cylinder bores with bores that have been reworked using the oversize method or the steel sleeve method, if necessary. This proposal is prompted by a review of the design of the flight control systems on Model 737 series airplanes. The actions specified by the proposed AD are intended to prevent a reduced rate of movement of the elevator, aileron, or rudder due to contamination of hydraulic fluid from chrome plating chips; such reduced rate of movement, if not corrected, could result in reduced controllability of the airplane.

## Notices in this docket

- Aug 28, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-21882, comments due Oct 24, 1996 (https://www.federalregister.gov/documents/1996/08/28/96-21882/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-series-airplanes)

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