AD 60-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-52-3 | Airworthiness Directives; Sikorsky Model S-52-3 Helicopters |
Unsafe Condition
Main Rotor Blade Assembly (P/N S11-10-2200) and Tail Rotor Blades (P/N S11-15-1100) may fail due to fatigue after reaching specified time-in-service. Clutch spindle, clutch spring, free wheel unit spring, and engine fan bolt components may fail due to design deficiencies requiring replacement with redesigned parts.
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Required Actions
Retire Main Rotor Blade Assembly (P/N S11-10-2200) at 1,100 hours' time-in-service. Retire Tail Rotor Blades (P/N S11-15-1100) at 1,700 hours' time-in-service. Replace Clutch Spindle (P/N S11-35-2006) with P/N S11-35-2009, Clutch Spring (P/N S11-35-2013) with P/N S11-35-2013-1, Free Wheel Unit Spring (P/N S11-35-2019) with P/N S11-35-2019-1, and Bolt (P/N 13273) with AN 76-10 Bolt. Check AN 76-10 bolt torque every 30 hours' time-in-service, retorque to minimum 370 inch-pounds, replace if below 300 inch-pounds. Inspect DSP4 bearings in rotating scissors and damper arm every 30 hours' time-in-service per Sikorsky Service Information Circular 1110-46, replace bearings every 100 and 300 hours respectively, switch to DSRP4 bearings to discontinue schedule.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective immediately for component retirement; effective October 14, 1960 for replacements and inspections. Compliance required as indicated in the AD.
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Affected Aircraft
Sikorsky Model S-52-3 helicopters, all serial numbers.
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Federal Register Abstract
Component Lines
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_60-19-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-19-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Sikorsky Model S-52-3 Helicopters Subject: Component Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sikorsky Aircraft Corporation Model: S-52-3 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-19-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-19-01 SUBJECT HEADING: Airworthiness Directives; Sikorsky Model S-52-3 Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-19-01 SIKORSKY: Amdt. 199 Part 507 Federal Register September 10, 1960. Applies to All S-52-3 Helicopters. Compliance required as indicated. As a result of further investigation of the service history of the HO5S-1 (S-52-3) helicopters, the following retirement, replacement and inspection schedules must be accomplished at the times indicated: (a) Effective immediately the following components must be retired from service at the hours of time in service indicated: P/N S11-10-2200 Main Rotor Blade Assembly -1,100 hours. P/N S11-15-1100 Tail Rotor Blades - 1,700 hours. (b) Effective October 14, 1960, the following components must be replaced with the redesigned components indicated, if not already accomplished: P/N S11-35-2006, Clutch Spindle, replace with P/N S11-35-2009. P/N S11-35-2013, Clutch Spring, replace with P/N S11-35-2013-1. P/N S11-35-2019, Free Wheel Unit Spring, replace with P/N S11-35- 2019-1. P/N 13273, Bolt, Engine Fan, replace with AN 76-10 Bolt. (c) Effective October 14, 1960, the following shall be accomplished at the times indicated: (1) The torque of the AN 76-10 bolts in the engine fan must be checked every 30 hours' time in service and retorqued if necessary to a minimum value of 370 inch- pounds. Bolts found with less than 300 inch-pounds torque must be replaced with new bolts. (Sikorsky Service Information Circular 1135-22 covers this subject.) (2) Within the next 30 hours' time in service and every 30 hours' time in service thereafter, inspect the DSP4 bearing in the rotating scissors in accordance with Sikorsky Service Information Circular 1110-46 and replace bearing every 100 hours' time in service with new bearing. When DSP4 bearing is replaced by DSRP4 bearing, the DSP4 inspection and replacement schedule no longer applies. (3) Within the next 30 hours' time in service and every 30 hours' time in service thereafter, inspect the DSP4 bearing in the damper arm in accordance with Sikorsky Service Information Circular 1110-46 and replace bearing every 300 hours' time in service with new bearing. When DSP4 bearing is replaced by DSRP4 bearing, the DSP4 inspection and replacement schedule no longer applies. This supersedes AD 60-04-06. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_60-19-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-19-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Sikorsky Model S-52-3 Helicopters Subject: Component Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sikorsky Aircraft Corporation Model: S-52-3 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: 60-19-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-19-01 SUBJECT HEADING: Airworthiness Directives; Sikorsky Model S-52-3 Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-19-01 SIKORSKY: Amdt. 199 Part 507 Federal Register September 10, 1960. Applies to All S-52-3 Helicopters. Compliance required as indicated. As a result of further investigation of the service history of the HO5S-1 (S-52-3) helicopters, the following retirement, replacement and inspection schedules must be accomplished at the times indicated: (a) Effective immediately the following components must be retired from service at the hours of time in service indicated: P/N S11-10-2200 Main Rotor Blade Assembly -1,100 hours. P/N S11-15-1100 Tail Rotor Blades - 1,700 hours. (b) Effective October 14, 1960, the following components must be replaced with the redesigned components indicated, if not already accomplished: P/N S11-35-2006, Clutch Spindle, replace with P/N S11-35-2009. P/N S11-35-2013, Clutch Spring, replace with P/N S11-35-2013-1. P/N S11-35-2019, Free Wheel Unit Spring, replace with P/N S11-35- 2019-1. P/N 13273, Bolt, Engine Fan, replace with AN 76-10 Bolt. (c) Effective October 14, 1960, the following shall be accomplished at the times indicated: (1) The torque of the AN 76-10 bolts in the engine fan must be checked every 30 hours' time in service and retorqued if necessary to a minimum value of 370 inch- pounds. Bolts found with less than 300 inch-pounds torque must be replaced with new bolts. (Sikorsky Service Information Circular 1135-22 covers this subject.) (2) Within the next 30 hours' time in service and every 30 hours' time in service thereafter, inspect the DSP4 bearing in the rotating scissors in accordance with Sikorsky Service Information Circular 1110-46 and replace bearing every 100 hours' time in service with new bearing. When DSP4 bearing is replaced by DSRP4 bearing, the DSP4 inspection and replacement schedule no longer applies. (3) Within the next 30 hours' time in service and every 30 hours' time in service thereafter, inspect the DSP4 bearing in the damper arm in accordance with Sikorsky Service Information Circular 1110-46 and replace bearing every 300 hours' time in service with new bearing. When DSP4 bearing is replaced by DSRP4 bearing, the DSP4 inspection and replacement schedule no longer applies. This supersedes AD 60-04-06. FOOTER:
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