76-06-02 BELL: Amendment 39-2554. Applies to Model 205A-1 helicopters, Serial Numbers 30001 through 30196, certified in all categories.
Compliance required within the next 25 hours' time in service after the effective date of this AD, unless already accomplished.
(a) Gain access to the engine fire extinguisher discharge cartridge, P/N 13083-45, mounted on the fire extinguisher agent container, as necessary, to determine if the legend "1272" is stamped on one of the hexagonal flats on the cartridge body. If this legend is found, proceed as follows:
(1) Disconnect the circuit breaker for the fire extinguisher system circuit.
(2) Disconnect aircraft wiring from the fire extinguisher discharge wiring.
(3) Using a short length of wire (safety wire is suitable), connect the actuation pin to the ground stud.
(4) Identify the 1 1/4" hexagonal nut into which the cartridge is threaded. Use an appropriate wrench to prevent this nut from turning and remove the cartridge from the nut. Leave the wire specified in item (3) attached on the cartridge terminals to prevent inadvertent detonation by static electricity.
(5) Attach a connecting wire as described in step (3) above to a suitable replacement cartridge and install the cartridge into the 1 1/4" hexagonal nut from which the defective cartridge was removed.
(6) Tighten the new cartridge to 90-100 inch pounds and lockwire to the 1 1/4" hexagonal nut.
(7) Remove the pin-to-stud connecting wire and reconnect aircraft wiring. Close the circuit breaker.
(b) If initial inspection of the cartridge reveals that the cartridge is not from the lot marked "1272," no further action is required to comply with this AD.
Completion of Steps 1, 2, and 4 of Bell Helicopter Service Bulletin No. 205-75-7, dated November 5, 1975, or later approved revision, will satisfy the requirements of this AD.
Equivalent methods of compliance with this airworthiness directive must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas 76106.
This amendment becomes effective April 26, 1976.