- Effective
- October 17, 1968
- Models
- 65-90, 65-A90, 65-A90-1, B90
- Data sheet
- TCDS3A20
- Registered aircraft
- 161 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-668
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 | 21 KB | f4c826e8…453df74 | FAA DRS (API key needed) |
On this page
The airworthiness directive
68-21-04 BEECHCRAFT: Amendment 39-668. Applies to Models 65-90, 65-A90 and 65-B90 aircraft (Serial Numbers LJ-1 through LJ-406) and 65-A90-1 aircraft (Serial Numbers LM-1 through LM-129).
Compliance required as indicated.
To reduce the possibility of engine damage and malfunction while operating in icing conditions above 15,000 feet MSL, within one year after the effective date of this Airworthiness Directive, unless already accomplished, accomplish the following:
(A) Install seal strips and a spring lockdown assembly on the Inertial Separator Vane and an automatic ignition (re-light) system in accordance with the method outlined in Beechcraft Service Instructions #0115-010 dated October 1, 1968.
(B) Equip the airplane with the applicable FAA Flight Manual as set forth in Beechcraft Service Instructions #0115-010 dated October 1, 1968.
(C) The Emergency Order Amending Type Certificate No. 3A20 dated May 24, 1968, as amended September 19, 1968, shall remainin force and effect as to each individual aircraft covered by this Airworthiness Directive until paragraphs (A) and (B) have been accomplished.
This amendment becomes effective October 17, 1968.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 161
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1964 | 1 |
|---|---|
| 1965 | 5 |
| 1966 | 13 |
| 1967 | 43 |
| 1968 | 19 |
| 1969 | 12 |
| 1970 | 5 |
| 1971 | 3 |
60 with no year recorded