63-18-02: Engine Breather
FAA order 63-18-02 is an airworthiness directive in force since September 1, 1963. The FAA's subject line: Engine Breather. It names Helio H-391, Helio H-395: about 33 aircraft on the U.S. register today across them, 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
- Helio Aircraft LLC
- Models
- H-391B, H-395 (USAF L-28A or U-10B), H-395A
- On this site
- Helio H-391 16 registered
Helio H-395 17 registered
Dates and paperwork
- In force since
- September 1, 1963
- 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 (797 characters)
63-18-02 HELIO: Amdt. 609 Part 507 Federal Register August 31, 1963. Applies to All Models H-391B, H-395 Serial Numbers 1 to 591, Inclusive, and H-395A Serial Numbers 1 to 1008, Inclusive.
Compliance required prior to September 15, 1963.
To preclude possible loss of engine oil through the vacuum oil separator due to blockage of the engine breather tube with ice or snow, accomplish the following:
Modify the oil breather tube P/N 391-060-317 by slicing a flute cut 18 inches from contour of lower cowl 0.25 to 0.31 inch depth and 0.75 inch in height on aft side of tube. This cut can be added to the present breather tube.
(Helio Service Bulletin No. 30A dated April 20, 1963, covers this same subject.)
This supersedes AD 62-12-05.
This directive effective September 1, 1963.
Related safety bulletins advice on the same designs, not orders
2018-11-21SW-18-31 · NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM
2018-05-09CE-18-14 · Main Landing Gear: Improved inspection at Drag Brace Location
2008-09-09CE-08-47 · Wings - Attachment Fittings
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/63-18-02.json · aircraft systems.