# Proposed AD 98-NM-84-AD: Lockheed Model L-188A and L-188C Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-24-25
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 13, 1998, 63 FR 43340
- Comments due: September 28, 1998
- Became: [AD 98-24-25](https://openairdocs.org/ad/98-24-25)
- Docket: 98-NM-84-AD
- FR document: 98-21719
- Official PDF: https://openairdocs.org/files/sha256/a8/0f/a80f2fc91870b61d5a8a1f28b2b68a5c8bf9b0a779b99b3e173de4463632d380 (from https://www.govinfo.gov/content/pkg/FR-1998-08-13/pdf/98-21719.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/08/13/98-21719/airworthiness-directives-lockheed-model-l-188a-and-l-188c-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-84-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Lockheed Model L-188A and L- 188C series airplanes. This proposal would require revising the Airplane Flight Manual to provide the flightcrew with modified procedures and limitations for operating in icing conditions. This proposal is prompted by incidents and accidents involving airplanes equipped with turboprop engines that experienced tailplane stall due to ice accretion on the horizontal stabilizer of the airplane. The actions specified by the proposed AD are intended to prevent undetected accretion of ice on the horizontal stabilizer, which could result in ice contaminated tailplane stall and consequent loss of pitch control.

## Notices in this docket

- Aug 13, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-21719, comments due Sep 28, 1998 (https://www.federalregister.gov/documents/1998/08/13/98-21719/airworthiness-directives-lockheed-model-l-188a-and-l-188c-series-airplanes)

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