- Effective
- April 30, 1976
- Models
- A-60S, A-B, A50S, A55, A55S, LD-S and 38 more
- Registered aircraft
- 949 matched by model
- Product
- Aircraft · Balloon
- Amendment
- 39-2587
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 May 30, 2024.
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 | 24 KB | c6536871…3530814 | FAA DRS (API key needed) |
On this page
The airworthiness directive
75-12-08 MICHAEL D. ADAMS and The Balloon Works Hot Air Balloons: Amendment 39-2228 as amended by Amendment 39-2587.
Applies to Rego 7553S series throttle or trigger valves installed on all models of Michael D. Adams and The Balloon Works Hot Air Balloons certificated in all categories.
Compliance required as indicated below after the effective date of this AD unless already accomplished.
To prevent failures of the "O" ring on the valve stem; valve seat washer loosening or valve actuating handle rollpin becoming dislodged, accomplish the following or an equivalent modification approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
Within the next 25 hours time in service, accomplish: Paragraph a, b, c and d. Paragraph "a" is to be accomplished thereafter at each 100 hours time in service or at each annual inspection, whichever comes first.
a. Remove the valve actuating lever rollpin P/N 7553S-8 from actuating lever. (Be carefulto remove any burrs in the stem area around the rollpin hole before removing the valve stem P/N 7553S-1 from the bonnet P/N 7553-5.) Replace the "O" ring stem seal with a new Rego "O" ring P/N 1421-7. Lubricate the new "O" ring with a suitable lubricant before reassembly.
b. Check the torque of the valve seat retaining screw to 10 to 12 in-lbs in the loosening direction. If it turns, the screw must be removed, cleaned of lubricant and reinstalled using MIL-S 22473 high strength thread locking compound, such as two ton epoxy by Devcon or Loctite 271 or equivalent. Recheck torque after thread locking compound has cured.
CAUTION: Do not permit the thread locking compound to adhere to the rubber seating surface.
c. Reinstall valve actuating lever on the valve body with rollpin, P/N 7553S-8. Install a number six machine screw and stop nut or a 3/32 inch stainless steel cotter pin or .040 inch diameter safety wire through the hole in the rollpin, holding the actuating handle to the valve body and secure.
d. Appropriate maintenance records must be kept in accordance with FAR 91.173.
Amendment 39-2228 became effective June 6, 1975. This Amendment 39-2587 becomes effective April 30, 1976.
Affected TCDS · 3
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 949
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1910 | 1 |
|---|---|
| 1974 | 2 |
| 1975 | 3 |
| 1976 | 3 |
| 1977 | 5 |
| 1978 | 10 |
| 1979 | 13 |
| 1980 | 8 |
| 1981 | 21 |
| 1982 | 15 |
| 1983 | 23 |
| 1984 | 8 |
| 1985 | 5 |
| 1986 | 4 |
| 1987 | 16 |
| 1988 | 9 |
| 1989 | 8 |
| 1990 | 13 |
| 1991 | 9 |
| 1992 | 16 |
| 1993 | 7 |
| 1994 | 14 |
| 1995 | 12 |
| 1996 | 33 |
| 1997 | 35 |
| 1998 | 35 |
| 1999 | 27 |
| 2000 | 26 |
| 2001 | 14 |
| 2002 | 27 |
| 2003 | 21 |
| 2004 | 16 |
| 2005 | 31 |
| 2006 | 15 |
| 2007 | 7 |
| 2008 | 5 |
| 2009 | 3 |
| 2010 | 3 |
| 2011 | 5 |
| 2012 | 2 |
| 2014 | 2 |
| 2015 | 2 |
| 2016 | 8 |
| 2017 | 8 |
| 2018 | 13 |
| 2019 | 14 |
| 2020 | 7 |
| 2021 | 17 |
| 2022 | 3 |
| 2023 | 3 |
| 2024 | 3 |
| 2025 | 1 |
338 with no year recorded