AD 91-20-10

91-20-10 BELL HELICOPTER TEXTRON, INC.: Amendment 39-8044. Docket No. 90- ASW-11.

Applicability: All Model 47G2, 47G2A, 47G2A1, 47G3, 47G3B1, 47G3B2, 47G3B2A, 47G4, 47G4A, 47G5, 47G5A, 47J, 47J2, and 47J2A helicopters, certificated in any category, with main rotor (M/R) grip part number (P/N) 47-120-252-11, installed.

Compliance: Required within the next 50 hours' time in service after the effective data of this AD, unless already accomplished.

To prevent failure of the M/R grip, which could result in loss of control of the helicopter, accomplish the following:

(a) Visually inspect the M/R grip and determine if one of the following serial numbers is installed:

IT- 0251, 0253, 0254, 0255, 0256, 0257, 0260, 0261, 0262, 0263, 0264, 0265, 0267, 0268, 0270, 0271,0272, 0273, 0274, 0275, 0276, 0277, 0278, 0279, 0280, 0281, 0282, 0284, 0285, 0286, 0289, 0290, 0291, 0293, 0294, 0295, 0296, 0297, 0299, 0300, 0302, 0303, 0306, 0308, 0312, 0313, 0315, 0316, 0317,0319, 0323, 0324, 0326, 0327, 0328, 0329, 0330, 0333, 0334, 0335 ITM- 0005, 0007, 0022, 0046, 0077, 0096, 0109, 0112, 0114, 0115, 0125, 0128, 0133, 0155, 0161, 0165, 0166, 0167, 0168, 0170, 0171, 0178, 0182, 0183, 0185, 0187, 0189, 0191, 0192, 0194, 0197, 0198, 0202, 0204, 0211, 0212, 0218, 0234, 0235, 0236, 0237, 0238, 0239, 0240, 0241, 0242, 0243, 0244, 0245, 0246, 0248, 0249, 0250, 0251, 0252, 0253, 0255, 0256, 0257, 0258, 0259, 0261, 0262, 0263, 0264, 0265, 0266, 0267, 0269, 0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277, 0278, 0279, 0280, 0281, 0282, 0283, 0284, 0286, 0287, 0288, 0289, 0290, 0291, 0292, 0293, 0294, 0295, 0296, 0297

(b) If one of the M/R grips listed in paragraph (a) is installed, remove and replace with a serviceable part.

(c) An alternate method of compliance or adjustment of the compliance times, which provides an equivalent level of safety, may be used if approved by the Manager, Rotorcraft Certification Office, Federal Aviation Administration, Fort Worth, Texas 76193-0170, telephone (817) 624-5170.

NOTE: If any of the M/R grips identified in paragraph (a) are found, either installed or as spares, the FAA recommends that the parts be permanently marked or defaced so that they cannot be misconstrued as airworthy.

This amendment (39-8044, AD 91-20-10) becomes effective on November 14, 1991.