AD 75-05-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707/720, 727, 737, and 747 Series Airplanes |
Unsafe Condition
Cracks in Arvan Inc./Tansey control cable pulleys MS 20220-3/-4 or SMS 20220-3/-4 (color black only) could lead to pulley failure and loss of control system function.
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Required Actions
Inspect control cable pulleys in critical areas within 25 hours time in service from the effective date. Replace cracked pulleys before further flight. Replace critical area pulleys within 100 hours, other affected pulleys within 600 hours, and all Arvan pulleys within 1800 hours with brown-colored replacements. Compliance varies by group per Boeing Service Bulletins.
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Compliance Time
Within specified timeframes: 25, 100, 600, or 1800 hours time in service from the effective date of Amendment 39-2096 (February 24, 1975) or this AD (April 7, 1975).
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Affected Aircraft
Boeing Models 707/720, 727, 737, and 747 series airplanes categorized in Groups I-V per Boeing Alert Service Bulletins, with Arvan/Tansey pulleys MS 20220-3/-4/SMS 20220-3/-4 (black only) or BAC P30F8/F9.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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