AD 47-49-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 Airplanes |
Unsafe Condition
Loss of the astrodome during pressurized cabin operations could result in structural failure or crew injury due to the absence of a cover plate, safety harness, and proper placarding.
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Required Actions
Install an internal cover plate of 3/16-inch 24ST aluminum alloy or equivalent, provide a navigator's safety harness with floor attachments, placard near the astrodome with specified warning, and inspect astrodome for cracks/crazing before each flight. If new laminated astrodome assembly and ring are installed, some requirements are waived but preflight inspection remains mandatory.
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Compliance Time
Prior to next flight
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 airplanes equipped with astrodomes during pressurized cabin operations unless permanently sealed off.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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