68-21-04: Ice Damage to Engine
FAA order 68-21-04 is an airworthiness directive in force since October 17, 1968. The FAA's subject line: Ice Damage to Engine. It names Beechcraft 65: about 201 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Textron Aviation Inc.
- Models
- 65-90, 65-A90, 65-A90-1, B90
- On this site
- Beechcraft 65 201 registered
Dates and paperwork
- In force since
- October 17, 1968
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (1,184 characters)
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.
Related safety bulletins advice on the same designs, not orders
2013-08-30CE-10-34R2 · Alternative Methods of Compliance (AMOC) to Airworthiness Directive (AD) 89-25-10 and 89-25-08
2013-08-20CE-10-34R1 · Alternative Methods of Compliance (AMOC) to Airworthiness Directive (AD) 89-25-10 and 89-25-08
2012-06-19CE-12-36 · Flight Controls: Aileron
2010-12-02CE-11-04 · Wings Wing Spar
2010-05-18CE-10-34 · Alternative Methods of Compliance (AMOC) to Airworthiness Directive (AD) 89-25-10 and AD 89-25-08
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 30, 2026. Connections as data: /graph/directive/68-21-04.json · aircraft systems.