AD 59-06-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Graviner | Fire Extinguishers | Airworthiness Directives; GRAVINER: Applies to Aircraft Fitted With Graviner Automatic Fire Extinguishers of the Separate Cartridge Type and the Following Type Numbers May Be Affected: Numbers 4AX, 4AZ, 5AX, 5AZ, 7AX, 8AX, 12A, 13A, 14A, 17A, 20A, 33A, 34A, 35A, 36A, 39A, 40A, 41A, 42A, 55A Through 63A |
Unsafe Condition
Age-hardening of the material used for sealing of the charge plug in automatic extinguishers of the separate cartridge type manufactured prior to August 1957 can interfere with charge plug movement when the cartridge is fired, stopping discharge of the extinguishant.
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Required Actions
Remove from service all affected extinguishers aged three years or more without Modification AU 332. Inspect charge plug sealant color (yellow/green for modified, brown/black for unmodified) if modification is uncertain. Return expired extinguishers to approved overhaul organizations for modification.
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Compliance Time
Compliance required as soon as possible but not later than September 1, 1959.
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Affected Aircraft
Aircraft fitted with Graviner Automatic Fire Extinguishers of the Separate Cartridge Type with Type Numbers 4AX, 4AZ, 5AX, 5AZ, 7AX, 8AX, 12A, 13A, 14A, 17A, 20A, 33A, 34A, 35A, 36A, 39A, 40A, 41A, 42A, 55A through 63A.
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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