COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Hot Air Balloons
AD/BAL/2
Amdt 1
Blast or Burner Valves 7/90
Applicability: All hot air balloons fitted with Rego series blast or burner valves.
Requirement: 1. Remove the valve actuating lever rollpin P/No 7553S-8 from actuating lever. (Be careful to remove any burrs in the stem area around the rollpin hole before removing the valve stem P/No 7553S-1 from the bonnet P/No 7553-5). Replace the O-ring stem seal with a new Rego O-ring P/No 1421-7. Lubricate the new O- ring with a suitable lubricant before reassembly.
2. For Rego 7553 S valves only. Check the torque of the valve seat retaining screw to 10-12 inch 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. Re-check torque after thread locking compound has cured.
CAUTION: Do not permit the thread locking compound to adhere to the rubber seating surface.
3. Reinstall valve actuating lever on the valve body with rollpin P/No 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.
Note: FAA AD 75-12-08 Amdt 39-2587 refers.
Compliance: Unless previously inspected, within 10 hrs time in service after 30 April 1986. Thereafter, reinspect at intervals not exceeding 100 hours or 12 months time in service, whichever occurs first.
Background: To prevent failures of the O-ring on the valve stem, valve seat washer loosening or valve actuating handle rollpin becoming dislodged. Amendment 1 requires ALL rego valves to be inspected.