# Proposed AD 99-CE-27-AD: REVO, Incorporated Models Lake LA-4, Lake LA-4A, Lake LA-4P, Lake LA-4-200, and Lake Model 250 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-10-22
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 6, 1999, 64 FR 54234
- Comments due: December 14, 1999
- Became: [AD 2000-10-22](https://openairdocs.org/ad/2000-10-22)
- Docket: 99-CE-27-AD
- FR document: 99-25920
- Official PDF: https://openairdocs.org/files/sha256/3a/03/3a038ecadf1145cdcb80772945d0f5d3a28c440c0acc4e3c3c15ef565024f27f (from https://www.govinfo.gov/content/pkg/FR-1999-10-06/pdf/99-25920.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/10/06/99-25920/airworthiness-directives-revo-incorporated-models-lake-la-4-lake-la-4a-lake-la-4p-lake-la-4-200-and
- Page: https://openairdocs.org/proposed/99-CE-27-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain REVO, Incorporated (REVO) Models Lake LA-4, Lake LA-4A, Lake LA-4P, Lake LA-4-200, and Lake Model 250 airplanes. The proposed AD would require inspecting the left and right wing upper and lower spar caps and doublers for cracks, replacing any cracked parts and/or incorporating a modification kit depending on the extent of the damage, and reporting the results of the inspection to the Federal Aviation Administration (FAA). The proposed AD is the result of a report of a fatigue crack found at the second most inboard wing attachment bolt hole on one of the affected airplanes. Similar fatigue cracking has since been reported on seven more of the affected airplanes. The actions specified by the proposed AD are intended to detect and correct cracks in the wing spar caps and doublers, which could result in loss of the wing with consequent loss of control of the airplane.

## Notices in this docket

- Oct 6, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-25920, comments due Dec 14, 1999 (https://www.federalregister.gov/documents/1999/10/06/99-25920/airworthiness-directives-revo-incorporated-models-lake-la-4-lake-la-4a-lake-la-4p-lake-la-4-200-and)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.