# AD 77-22-03: Ring Segment - VHF Antenna

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed Martin 1329-23A, 1329-23D, 1329-23E and 1329-25
- Effective: October 28, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3063
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F70E7E3B6278444D8625697500491D5A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-22-03

## The airworthiness directive

77-22-03 LOCKHEED: Amendment 39-3063. Applies to all Model 1329-23A and Model 1329-23D airplanes, serial numbers 5001 through 5092, 5094 through 5096 and 5121; all Model 1329-23E airplanes, serial numbers 5093, 5097 through 5120 and 5122 through 5162; and all Model 1329-25 airplanes, serial numbers 5201 through 5221.

Compliance is required as indicated, unless already accomplished.

To prevent failure of the reinforcing doubler and ring segment for the lower VHF antenna, accomplish the following:

On Model 1329-23A, Model 1329-23D and Model 1329-23E airplanes, within the next 25 hours flying time, inspect for cracks in the reinforcing doubler and ring segment for the lower VHF antenna in accordance with Service Bulletin 329-281 or later FAA approved revision. If cracks are found, before further flight, replace the reinforcing doubler and ring segment in accordance with Service Bulletin 329-281 or later FAA approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region.

On Model 1329-23A, Model 1329-23D and Model 1329-23E airplanes on which cracks are not found, within the next 300 hours flying time, replace the reinforcing doubler and ring segment in accordance with Service Bulletin 329-281 or later FAA approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region.

On Model 1329-25 airplanes, serial numbers 5201 through 5221, within the next 300 hours flying time, replace the reinforcing doubler and ring segment in accordance with Service Bulletin 329II-53-6 or later FAA approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region.

This amendment becomes effective October 28, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A15](https://openairdocs.org/tcds/2A15): Lockheed Martin Corporation; names 4 of 4 models: 1329-23D, 1329-23A, 1329-25, 1329-23E

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 6 (6 by airframe model, 0 by engine model)
- Makers: Lockheed 6

Models with the most aircraft:

- [Lockheed 1329-25 JETSTAR II](https://openairdocs.org/model/lockheed-1329-25-jetstar-ii): 5 aircraft (airframe model)
- [Lockheed 1329-23E](https://openairdocs.org/model/lockheed-1329-23e): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/77-22-03/models.md
Every aircraft: https://openairdocs.org/ad/77-22-03/aircraft.md

Its text cites no advisory circulars or STCs.

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