# AD 77-14-13: Airplane Roll

- Type: Airworthiness directive
- Status: Current
- Products: Textron BH.125 Series 600A
- Effective: August 8, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2958
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/22F556ABE13C5647862569A500672D2B.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/77-14-13

## The airworthiness directive

77-14-13 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2958. Applies to Model BH-125 Series 600A airplanes, S/N's 25/6001-6004, 6007, 6009-6011, 6013, 6014, 6016, 6018, 6020, 6022-6026, 6032, 6034, 6038, 6040, 6044, 6046, certificated in all categories.

Compliance is required within the next 300 hours time in service after the effective date of this AD, unless already accomplished.

To prevent possible unwanted rolling of the airplane when operating at buffet onset, add vortex generators to the leading edge of each wing by incorporating Hawker Siddeley Aviation, Ltd., Modification No. 252442 in accordance with Section 2 entitled "Accomplishment Instructions" of Hawker Siddeley Aviation, Ltd., Service Bulletin 57-48-(2442), dated June 25, 1975, including Revision 1, dated July 23, 1975, or an FAA-approved equivalent.

This amendment becomes effective August 8, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A3EU](https://openairdocs.org/tcds/A3EU): Textron Aviation Inc.; names 1 of 50 models: BH.125 Series 600A

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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