# Proposed AD 96-NM-146-AD: Boeing Model 737 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-05-09
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 28, 1996, 61 FR 44232
- Comments due: October 24, 1996
- Became: [AD 97-05-09](https://openairdocs.org/ad/97-05-09)
- Docket: 96-NM-146-AD
- FR document: 96-21878
- Official PDF: https://openairdocs.org/files/sha256/a6/88/a6885aae50530982d6d56c911636d4720585eea67c1d595802809ea903c7ffbe (from https://www.govinfo.gov/content/pkg/FR-1996-08-28/pdf/96-21878.pdf)
- Federal Register: https://www.federalregister.gov/documents/1996/08/28/96-21878/airworthiness-directives-boeing-model-737-series-airplanes
- Page: https://openairdocs.org/proposed/96-NM-146-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 737 series airplanes. This proposal would require replacement of the flow restrictors of the aileron and elevator power control units (PCU's) with new flow restrictors. 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 reduced roll and/or pitch rate control of the airplane and consequent increased pilot workload as a result of fragments from a deteriorated flow restrictor filter screen becoming lodged in the PCU.

## Notices in this docket

- Aug 28, 1996: Notice of proposed rulemaking (NPRM). (first notice), FR document 96-21878, comments due Oct 24, 1996 (https://www.federalregister.gov/documents/1996/08/28/96-21878/airworthiness-directives-boeing-model-737-series-airplanes)

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