| AD Number | 59-06-08 | Status | Active |
| Effective Date | Not specified | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Appliance"] | Product Subtype | Not specified |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Graviner |
| Model(s) | Fire Extinguishers |
59-06-08 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.
Compliance required as soon as possible but not later than September 1, 1959.
(1) Experience in service has revealed that age-hardening of the material used for sealing of the charge plug in automatic extinguishers of the separate cartridge type which were manufactured prior to August 1957 can interfere with the charge plug movement when the cartridge is fired and thus stop discharge of the extinguishant.
(2) A different type of sealant has been introduced by Graviner Modification AU 332. Incorporation of this modification is signified by the letter "L" stamped adjacent to the serial number of the extinguisher, or to the date of manufacture, both of which appear on the operating head. The above date appears as two numbers which signify the month of the year of manufacture (e.g. 8/57 signifies August 1957) but care must be taken to avoid confusion with the cartridge manufacture date which is stamped in a similar manner on the cartridge flange.
(3) All extinguishers indicated above which are of an age of three years or more and which do not embody Modification AU 332 must be removed from service. Replacement extinguishers should preferably be of the modified type although unmodified units may be fitted provided the three-year life is not exceeded.
(4) If doubt exists as to whether the modification has been incorporated, the light alloy junction box may be removed and the charge plug sealant inspected. The new sealant is of a yellow/green color, the old type is of a brown/black color.
(5) Extinguishers which have exceeded the three-year life should be returned to an overhaul organization approved by Graviner Manufacturing Co. Ltd., Poyle Mill Works, Colnbrook, Buck, England, for modification. (Fenwal Inc., Pleasant Street, Ashland, Mass., is an approved Overhaul Agency.)
The British Air Registration Board considers this mandatory. The FAA concurs with this action and compliance therewith mandatory.