- Effective
- May 10, 1978
- Models
- BH.125 Series 600A, HS.125 Series 600A
- Data sheet
- TCDSA3EU
- Product
- Aircraft · Large airplane
- Amendment
- 39-3180
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed January 21, 2026.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | 0df1871d…1a34140 | FAA DRS (API key needed) |
On this page
The airworthiness directive
78-08-01 HAWKER SIDDELEY AVIATION LIMITED: Amendment 39-3180. Applies to BH/HS 125-600A airplanes, certificated in all categories.
Compliance required within one month after the effective date of this AD, unless already accomplished.
To prevent possible inability to activate the engine blow-off valve switches in the event that birds are ingested into the engines on take-off, accomplish the following:
Remove the existing switch guards for the engine blow-off valve switches and replace with the new design guard, P/N 25-6 NF 2629, in accordance with the section entitled "Accomplishment Instructions" and the associated drawing, contained in Hawker Siddeley Aviation, Ltd. Service Bulletin 75-3(2580), dated June 21, 1977, or an FAA-approved equivalent.
This amendment becomes effective May 10, 1978.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.