# AD 75-12-08: Throttle or Trigger Valves - Type: Airworthiness directive - Status: Current - Products: McGrath, Michael D. A-60S, A-B, A50S, A55, A55S, LD-S, Galaxy-7, Galaxy-8, Galaxy-9, Galaxy 10, Galaxy 11, Galaxy 11B and 32 more - Effective: April 30, 1976 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Balloon - Amendment: 39-2587 - Registered aircraft: 949 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B852A8C062A3A0286256E120049868F.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/75-12-08 ## 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 data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A14SO](https://openairdocs.org/tcds/A14SO): JR Aerosports Ltd.; names 26 of 28 models: Firefly 8B Sphere, Firefly 11, Firefly 9B-15, Firefly 8-24, Firefly 6B-15, Firefly 8B, Firefly 7-15, Firefly JC-9B… - [TCDS A10NM](https://openairdocs.org/tcds/A10NM): JR Aerosports Ltd.; names 12 of 12 models: Galaxy 8B, Galaxy 10, Galaxy 6, Galaxy 7B, Galaxy 11B, Galaxy 9B, Galaxy 11, Newport… - [TCDS A15SO](https://openairdocs.org/tcds/A15SO): Adams Aerostats LLC; names 6 of 6 models: A50S, LD-S, A55, A55S, A-B, A-60S ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 949 (949 by airframe model, 0 by engine model) - Makers: Balloon Works 565, Firefly Balloons 174, Adams Balloon 78, Adams Balloons 37, Firefly Balloons 2010 37, Andrew Philip Richardson DBA 26, Galaxy Balloons 24, Adams Balloon Loft 4, Elizabeth Adams Walz 2, General Balloon 1 Models with the most aircraft: - [Balloon Works FIREFLY 7-15](https://openairdocs.org/model/balloon-works-firefly-7-15): 157 aircraft (airframe model) - [Balloon Works FIREFLY 7](https://openairdocs.org/model/balloon-works-firefly-7): 129 aircraft (airframe model) - [Balloon Works FIREFLY 8B-15](https://openairdocs.org/model/balloon-works-firefly-8b-15): 123 aircraft (airframe model) - [Firefly Balloons FIREFLY 8B-15](https://openairdocs.org/model/firefly-balloons-firefly-8b-15): 73 aircraft (airframe model) - [Firefly Balloons FIREFLY 7-15](https://openairdocs.org/model/firefly-balloons-firefly-7-15): 53 aircraft (airframe model) - [Balloon Works FIREFLY 8B](https://openairdocs.org/model/balloon-works-firefly-8b): 37 aircraft (airframe model) - [Adams Balloon A55S](https://openairdocs.org/model/adams-balloon-a55s): 35 aircraft (airframe model) - [Balloon Works FIREFLY 7B-15](https://openairdocs.org/model/balloon-works-firefly-7b-15): 33 aircraft (airframe model) - [Balloon Works FIREFLY 7-B](https://openairdocs.org/model/balloon-works-firefly-7-b): 26 aircraft (airframe model) - [Adams Balloon A55](https://openairdocs.org/model/adams-balloon-a55): 24 aircraft (airframe model) - [Balloon Works FIREFLY 8](https://openairdocs.org/model/balloon-works-firefly-8): 18 aircraft (airframe model) - [Adams Balloons A-B](https://openairdocs.org/model/adams-balloons-a-b): 14 aircraft (airframe model) - [Galaxy Balloons GALAXY 7](https://openairdocs.org/model/galaxy-balloons-galaxy-7): 14 aircraft (airframe model) - [Balloon Works FIREFLY 6B](https://openairdocs.org/model/balloon-works-firefly-6b): 12 aircraft (airframe model) - [Firefly Balloons FIREFLY 8](https://openairdocs.org/model/firefly-balloons-firefly-8): 12 aircraft (airframe model) - [Firefly Balloons 2010 FIREFLY 8](https://openairdocs.org/model/firefly-balloons-2010-firefly-8): 11 aircraft (airframe model) - [Firefly Balloons 2010 FIREFLY 8B-15](https://openairdocs.org/model/firefly-balloons-2010-firefly-8b-15): 11 aircraft (airframe model) - [Andrew Philip Richardson DBA A-B](https://openairdocs.org/model/andrew-philip-richardson-dba-a-b): 10 aircraft (airframe model) - [Adams Balloon A50S](https://openairdocs.org/model/adams-balloon-a50s): 10 aircraft (airframe model) - [Adams Balloons A55S](https://openairdocs.org/model/adams-balloons-a55s): 10 aircraft (airframe model) All 67 models: https://openairdocs.org/ad/75-12-08/models.md Every aircraft: https://openairdocs.org/ad/75-12-08/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.