# AD 77-15-16: Structure of Horizontal Stabilizer

- Type: Airworthiness directive
- Status: Current
- Products: BAE Systems HS 748 Series 2A
- Effective: August 29, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2987
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DEE636E809C378E8862569A500703C8A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-15-16

## The airworthiness directive

77-15-16 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2987. Applies to Model H.S. 748, Series 2A airplanes, all serial numbers, certificated in all categories.

Compliance is required as indicated, unless already accomplished.

To prevent cracks in the outboard and center elevator hinge ribs and associated structure of the horizontal stabilizer, accomplish the following:

  (a) Within the next 100 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 100 hours time in service from the last inspection, visually inspect the area of the outboard and center elevator hinge ribs in accordance with Part 2A of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin No. 55/11, dated October 15, 1973, or an FAA-approved equivalent.

  (b) If, during an inspection required by paragraph (a) of this AD, a crack, loose rivets, or corroded support bearings or pivot pins are found, before further flight, conduct an internal inspection of the area where the affected hinge ribs attach to the stabilizer rear spar in accordance with Part 2B of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin No. 55/11, dated October 15, 1973, or an FAA-approved equivalent, and comply with paragraph (c) of this AD.

  (c) If, during an inspection required by paragraph (a) or (b) of this AD, a crack, loose rivets, or corroded support bearings or pivot pins are found, before further flight, replace or repair the affected parts, as appropriate, in accordance with Part 2C of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin No. 55/11, dated October 15, 1973, or an FAA-approved equivalent, and thereafter, continue to comply with paragraphs (a), (b), and (c) of this AD.

  (d) Within the next 1000 hours time in service after the effective date of this AD, replace the external gusset plates (top and bottom) at the outboard and center elevator hinge ribs with larger and heavier gusset plates and add inspection holes in accordance with Parts 2A, 2B, 2C, and 2E of the section entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin No. 55/12, dated January 2, 1974, or an FAA-approved equivalent.

  (e) Upon incorporation of the alterations required by paragraph (d) of this AD, the repetitive inspections required by this AD may be discontinued.

This amendment becomes effective August 29, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A24EU](https://openairdocs.org/tcds/A24EU): BAE Systems (Operations) Limited; names 1 of 2 models: HS 748 Series 2A

## 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: 2 (2 by airframe model, 0 by engine model)
- Makers: British Aerospace 2

Models with the most aircraft:

- [British Aerospace HS-748-2A](https://openairdocs.org/model/british-aerospace-hs-748-2a): 2 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/77-15-16/models.md
Every aircraft: https://openairdocs.org/ad/77-15-16/aircraft.md

Its text cites no advisory circulars or STCs.

---
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.