# AD 77-23-10: Spar Web and Bolts

- Type: Airworthiness directive
- Status: Current
- Products: K & L Soaring SGS 2-33, SGS 2-33A and SGS 2-33AK
- Effective: June 21, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Glider
- Amendment: 39-3241
- Registered aircraft: 212 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/81EE8E74922B8AA386256E120055AA47.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-23-10

## The airworthiness directive

77-23-10 SCHWEIZER: Amendment 39-3078, as amended by Amendment 39-3241. Applies to all Schweizer SGS 2-33, 2-33A and 2-33AK Gliders. Compliance required as indicated.

  (a) Within the next 25 hours in service, after the effective date of this AD, unless previously accomplished within the last 75 hours in service, visually inspect the vertical stabilizer spar-to-fuselage attachment bolts and spar web in accordance with Schweizer Service Bulletin No. 102-33-2, dated September 2, 1977, or an approved equivalent inspection.

  (b) Repeat the inspection specified in (a) at intervals not to exceed 100 hours in service or six months, whichever occurs first, from the last such inspection.

  (c) Before further flight, repair cracked parts or elongated holes in accordance with the above Schweizer service bulletin, or with an approved equivalent repair, or replace defective parts with new parts of the same part number or with approved equivalent parts.

  (d) Report all defects found during compliance with this AD to the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region (Reporting Approved by the Office of Management and Budget under OMB No. CAR0174).

  (e) Recommended repairs noted in paragraph 1.g. and 1.h. of the service bulletin and equivalent inspections, repairs, alterations or parts must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

  (f) The repetitive inspection required by (b) may be discontinued when an undamaged vertical stabilizer spar is altered in accordance with paragraph (3) of Schweizer Service Bulletin No. 102-33-2, dated March 17, 1978, or an equivalent.

  (g) Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the inspection interval specified in this AD.

Amendment 39-3078 was effective November 18, 1977.

This amendment 39-3241 is effective June 21, 1978.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS G2EA](https://openairdocs.org/tcds/G2EA): K & L Soaring LLC; names 3 of 4 models: SGS 2-33AK, SGS 2-33, SGS 2-33A

## 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: 212 (212 by airframe model, 0 by engine model)
- Makers: Schweizer 212

Models with the most aircraft:

- [Schweizer SGS 2-33A](https://openairdocs.org/model/schweizer-sgs-2-33a): 173 aircraft (airframe model)
- [Schweizer SGS 2-33](https://openairdocs.org/model/schweizer-sgs-2-33): 38 aircraft (airframe model)
- [Schweizer SGS 2-33AK](https://openairdocs.org/model/schweizer-sgs-2-33ak): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/77-23-10/models.md
Every aircraft: https://openairdocs.org/ad/77-23-10/aircraft.md

Its text cites no advisory circulars or STCs.

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