AD 74-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707/720/727/737/747 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707/720/727/737/747 Series Airplanes |
Unsafe Condition
The unsafe condition involves potential fire hazard due to wear, abrasion, and corrosion of electrical appurtenances, including wiring, terminal boxes, switches, and hot water heaters located within lavatory waste container areas.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect electrical appurtenances within lavatory waste container areas for wear, abrasion, and corrosion and replace as necessary. Accomplish lavatory rework via specified Boeing Service Bulletins by December 31, 1975 and June 30, 1976.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 300 hours time in service from the effective date of this AD, unless already accomplished within the last 1,000 hours, and by December 31, 1975 and June 30, 1976 as applicable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Models 707/720/727/737/747 series airplanes, certificated in all categories.
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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