AD 71-08-03 ACTIVE

71-08-03 BELL: Amdt. 39-1190 as amended by Amendment 39-1330. Applies to Model 206A-1 helicopters, serial numbers 39998 through 40994 and to all Model 206A helicopters equipped with Particle Separator Kit, Self Purging, P/N 206-706-201-1, or P/N 206-706-200-1, certificated in all categories.

Compliance required before further flight in snow, but no later than 25 hours time in service after the effective date of this airworthiness directive, unless already accomplished.

1. To prevent power interruption caused by ingestion into the engine of snow or ice which may have accumulated in the engine inlet during flight, crew notification of a limitation against flight into snow must be accomplished as follows:

a. Install a permanent type placard in full view of the pilot as near as possible to the basic limitations placard, worded as follows:

"FLIGHT INTO FALLING OR BLOWING SNOW IS NOT PERMITTED"

b. If approved placards are unavailable, the owner or operator maymake and use a placard containing the above words. Letters must be at least 1/8 inch in height.

2. Alternatively, upon accomplishment of modifications listed below, the placard required by paragraph 1. may be removed and flight operations may be conducted in falling or blowing snow for periods not in excess of ninety minutes, provided flight visibility due to snow is not less than one-half mile.

a. For the Model 206A-1, S/N 39998 through 40994, install Particle Separator Assembly, P/N 206-062-819-5 in accordance with Bell Helicopter Company Drawing 206-062-800-5. Incorporate revised pages A, 7, 13, 15 and 20, approved and dated October 26, 1971, into the Model 206A-1 Flight Manual, approved and dated May 5, 1969.

b. For Model 206A helicopters equipped with Particle Separator Kit, Self Purging, P/N 206-706-201-1 or P/N 206-706-200-1, modify and/or replace particle separator system components as indicated in applicable sections of Bell Service Instruction No. 206-89, revised October 25, 1971, or later FAA approved revision. Incorporate revised pages A, B, and D, approved and dated October 18, 1971, into the Model 206A Flight Manual, approved and dated October 20, 1966, or later FAA approved reissues. Incorporate revised pages 1, 2, and 5, approved and dated October 18, 1971, into the Model 206A Flight Manual Supplement titled "Snow Particle Separator - Engine Air Induction System," approved and dated July 23, 1970.

Alternate means of compliance or equivalent replacement parts may be acceptable if approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration, Fort Worth, Texas.

Amendment 39-1190 became effective April 12, 1971.
This amendment 39-1330 becomes effective November 18, 1971.