| AD Number | 83-18-51 R2 | Status | Active |
| Effective Date | May 31, 1984 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-4862 |
| Product Type | ["Aircraft"] | Product Subtype | ["Rotorcraft"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Columbia Helicopters, Inc. |
| Model(s) | 234 |
83-18-51 R2 BOEING VERTOL COMPANY: Amendment 39-4862. Applies to Boeing Vertol Model 234 series helicopters certificated in all categories.
Compliance is required as indicated.
To prevent possible hazards in flight associated with cracking of the main rotor head pitch shafts, accomplish the following:
(a) Unless already accomplished, prior to further flight on helicopters equipped with main rotor head pitch shafts Part Numbers (P/N) 114R2088-7, -14, -15, -16, conduct an eddy current inspection of the pitch shaft in accordance with the Accomplishment Instructions (Part 2) of Boeing Vertol Service Bulletin No. 234-64-1006, Revision 2, dated August 25, 1983, or (Part 3) of Service Bulletin No. 234-64-1006 dated January 16, 1984.
(b) After the initial inspection of paragraph (a), repeat the inspection of paragraph (a) at intervals not to exceed 15 hours time in service.
(c) Remove from service pitch shafts having a crack and replace with a serviceable part prior to further flight.
(d) An equivalent method of compliance with this AD may be used when approved by the Manager, New York Aircraft Certification Office, 181 South Franklin Avenue, Valley Stream, New York 11581.
(e) Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Manager, New York Aircraft Certification Office, FAA, New England Region, may adjust the compliance times specified in this AD.
(f) Within the next 25 hours time in service from the effective date of this AD or prior to the accumulation of 550 hours time in service, whichever occurs later, remove from service at main rotor head pitch shafts P/N's 114R2088-14 and -16 and replace with serviceable parts.
(g) Within the next 25 hours time in service from the effective date of this AD or prior to the accumulation of 700 hours time in service, whichever occurs later, remove from service forward main rotor head pitch shafts P/N's 114R2088-7 and -15 and replace with serviceable parts.
This amendment becomes effective May 31, 1984, as to all persons except those persons to whom it was made immediately effective by telegraphic AD's No. T83-18-51, issued September 2, 1983, and No. T83-18-51R1, issued October 28, 1983, which contained parts of this amendment.