# AD 48-34-01: Stabilizer Attachment Fittings

- Type: Airworthiness directive
- Status: Current
- Products: Textron Army AT-11, C18S, D18C, D18C-T and D18S
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 68 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B3D5817E58CCE3A886256A1C0072D51F.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/48-34-01

## The airworthiness directive

48-34-01 BEECH: Applies to All Models AT-11, C18S Airplanes Which Have Been Modified in Accordance With Beech Service Bulletin D18-48 Referred to in AD 47-33-5 and All D18C, D18S and D18C-T Airplanes Which Have Been Modified in Accordance With Beech Service Bulletin D18C-3 Referred to in AD 47-33-06.

Inspection required at next periodic inspection.

Inspect the NAS 144 bolts, (identified by the stamped bolt head), installed in the revised stabilizer attachment fittings to determine that the depth of the outer dimension of the bolt head conforms to the acceptable limit of 0.226 inch plus or minus 0.010 inch. Bolts that do not meet this specification are under strength and must be replaced. Inspect the fuselage to stabilizer attachment fitting, P/N 437-186096, to determine that this fitting has not cracked where the lower 1/4-inch rivet attaches the fitting to the fuselage.

(Beech Service Bulletin No. D18-51 covers this same subject.)

## Affected data sheets (4) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-765](https://openairdocs.org/tcds/A-765): Textron Aviation Inc.; names 2 of 17 models: D18S, D18C
- [TCDS A-2-582](https://openairdocs.org/tcds/A-2-582): Textron Aviation Inc.; names 1 of 2 models: Army AT-11
- [TCDS A-757](https://openairdocs.org/tcds/A-757): Textron Aviation Inc.; names 1 of 1 models: C18S
- [TCDS TC 770](https://openairdocs.org/tcds/TC%20770): Hawker Beechcraft Corporation; names 1 of 2 models: D18C-T

## 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: 68 (68 by airframe model, 0 by engine model)
- Makers: Beech 68

Models with the most aircraft:

- [Beech D18S](https://openairdocs.org/model/beech-d18s): 55 aircraft (airframe model)
- [Beech C18S](https://openairdocs.org/model/beech-c18s): 13 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/48-34-01/models.md
Every aircraft: https://openairdocs.org/ad/48-34-01/aircraft.md

Its text cites no advisory circulars or STCs.

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