AD 82-11-01

82-11-01 ROBINSON HELICOPTER COMPANY: Amendment 39-4374. Applies to Model R-22 series helicopters certificated in all categories incorporating upper steel tube frame P/N A020-2, Serial No.'s 0002 through 0287.

Compliance required as indicated, unless already accomplished.

To prevent failure of the A020-2 framework which could result in loss of the helicopter, accomplish the following:

(a) Within 10 hours' additional time in service after the effective date of this AD, visually inspect for cracks in the A020-2 upper steel tube frame per Inspection Procedure No. 1 of Robinson Helicopter Company Service Bulletin No. 18, dated February 15, 1982, or FAA approved equivalent and repeat this inspection thereafter at intervals not to exceed 50 hours' time in service since the last such inspection.

(b) During the daily preflight, visually check for cracks in the area noted in Figure 1 of Robinson Helicopter Company Service Bulletin No. 18, dated February 15, 1982.NOTE 1: The preflight checks required by paragraph (b) of this AD may be performed by the pilot.

NOTE 2: For the requirements regarding the listing of compliance and method of compliance with this AD in the airplane's permanent maintenance record, see FAR 91.173.

(c) If cracks are found, replace P/N A020-2 frame with like serviceable part prior to further flight.

(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate rotorcraft to a base for the accomplishment of inspections required by this AD.

(e) Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Chief, Western Aircraft Certification Field Office, Northwest Mountain Region.

This amendment becomes effective May 21, 1982.