AD 85-18-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Erickson Air-Crane | S-64E | Airworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters |
Unsafe Condition
The possible loss of the main rotor blade outboard spar and subsequent loss of the counterweight train.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect main rotor blade outboard spars (P/N 6415-20201-043 and -045) within 30 hours time in service after the effective date, and thereafter every 30 hours. Fluorescent penetrant inspect the same parts within 30 hours time in service after the effective date (unless done in last 120 hours) and then every 150 hours. Replace cracked blades before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 30 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 30 hours time in service from the last inspection (for visual inspection). For fluorescent penetrant inspection: within the next 30 hours time in service after the effective date (unless already accomplished within the last 120 hours time in service), and thereafter at intervals of 150 hours time in service from the last inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Aircraft Model S-64E helicopters, certificated in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Rotor Blade Outboard Spars
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_85-18-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 85-18-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters Subject: Main Rotor Blade Outboard Spars Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/12/1985 Make: Erickson Air-Crane Model: S-64E Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 85-18-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5116 AD NUMBER: 85-18-01 SUBJECT HEADING: Airworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters ACTION: SUMMARY: DATES: Effective September 12, 1985. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 85-18-01 SIKORSKY AIRCRAFT: Amendment 39-5116. Applies to Sikorsky Aircraft Model S-64E helicopters, certificated in all categories. Compliance is required as indicated, unless already accomplished. To prevent the possible loss of the main rotor blade outboard spar and subsequent loss of the counterweight train, accomplish the following: (a) Within the next 30 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 30 hours time in service from the last inspection, visually inspect main rotor blade outboard spars, Part Numbers (P/N) 6415-20201-043 and -045, for cracks in accordance with Section 2, Paragraph A of Sikorsky Alert Service Bulletin No. 64B15- 8A, dated October 16, 1984, or later FAA-approved revision. (b) Within the next 30 hours time in service after the effective date of this AD,unless already accomplished within the last 120 hours time in service, and thereafter at intervals of 150 hours time in service from the last inspection, fluorescent penetrant inspect main rotor blade outboard spars, P/N's 6415-20201-043 and -045, for cracks in accordance with Section 2, Paragraph B of Sikorsky Alert Service Bulletin No. 64B15-8A, dated October 16, 1984, or later FAA approved revision. (c) If a crack is found, replace with an airworthy blade that has been inspected in accordance with paragraphs (a) and (b) above prior to further flight. (d) Aircraft may be ferried in accordance with the provisions of FAR Sections 21.197 and 21.199 to a base where the AD can be accomplished. (e) Upon request of an operator, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone (617) 273-7118. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Sikorsky Aircraft, Division of United Technologies Corporation, North Main Street, Stratford, Connecticut 06601. These documents also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, Southwest Region, 4400 Blue Mound Road, Fort Worth, Texas 76106. This amendment becomes effective September 12, 1985. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_85-18-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 85-18-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters Subject: Main Rotor Blade Outboard Spars Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/12/1985 Make: Erickson Air-Crane Model: S-64E Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 85-18-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5116 AD NUMBER: 85-18-01 SUBJECT HEADING: Airworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters ACTION: SUMMARY: DATES: Effective September 12, 1985. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 85-18-01 SIKORSKY AIRCRAFT: Amendment 39-5116. Applies to Sikorsky Aircraft Model S-64E helicopters, certificated in all categories. Compliance is required as indicated, unless already accomplished. To prevent the possible loss of the main rotor blade outboard spar and subsequent loss of the counterweight train, accomplish the following: (a) Within the next 30 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 30 hours time in service from the last inspection, visually inspect main rotor blade outboard spars, Part Numbers (P/N) 6415-20201-043 and -045, for cracks in accordance with Section 2, Paragraph A of Sikorsky Alert Service Bulletin No. 64B15- 8A, dated October 16, 1984, or later FAA-approved revision. (b) Within the next 30 hours time in service after the effective date of this AD,unless already accomplished within the last 120 hours time in service, and thereafter at intervals of 150 hours time in service from the last inspection, fluorescent penetrant inspect main rotor blade outboard spars, P/N's 6415-20201-043 and -045, for cracks in accordance with Section 2, Paragraph B of Sikorsky Alert Service Bulletin No. 64B15-8A, dated October 16, 1984, or later FAA approved revision. (c) If a crack is found, replace with an airworthy blade that has been inspected in accordance with paragraphs (a) and (b) above prior to further flight. (d) Aircraft may be ferried in accordance with the provisions of FAR Sections 21.197 and 21.199 to a base where the AD can be accomplished. (e) Upon request of an operator, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone (617) 273-7118. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Sikorsky Aircraft, Division of United Technologies Corporation, North Main Street, Stratford, Connecticut 06601. These documents also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, Southwest Region, 4400 Blue Mound Road, Fort Worth, Texas 76106. This amendment becomes effective September 12, 1985. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2023-11-07
final ruleAirworthiness Directives; Various Helicopters
Unsafe Condition: unsafe condition on these products.
2013-23-07
final ruleAirworthiness Directives; Erickson Air-Crane Incorporated Helicopters (Type Certificate Previously Held by Sikorsky Aircraft Corporation)
Unsafe Condition: A crack in the main rotor blade, which could result in blade separation and subsequent loss of control of the helicopter.
85-25-03
final ruleAirworthiness Directives; SIKORSKY AIRCRAFT Model S-64E Helicopters
Unsafe Condition: Cracked or corroded main rotor head torque tube inner bracket assembly, Part Number S1510-21332-0, could result in failure of the main rotor head assembly.
76-06-01
final ruleAirworthiness Directives; Sikorsky Models S-61L, S-61N, S-61NM, S-61R, S-62A, S-64A, S-64E, S-64F Helicopters, Including Military CH-3C, HH-3C, CH-3E, HH-3E, and CH-54B Helicopters
Unsafe Condition: Flaking chrome plating from the pistons of Model 66WAP200 and Model 66WAN200 hydraulic pumps with specified serial numbers could lead to hydraulic system contamination and failure.