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1. Engine Cowl. a. General. - The engine cowl consists of several sections, which are of spot-welded and riveted aluminum-alloy construction, except for those portions of the cowl adjacent to the exhaust stacks which are stainless steel. The engine cowl sections are reinforced by formers which are supported by numerous fittings attached to the engine mount. The forward ends of the cowling are supported by a bulkhead which is attached to the bosses on the engine reduction gear housing. That portion of the cowl which must be frequently removed for servicing is attached with Dzus fasteners. Access doors are provided for the coolant expansion tank and starter crank. b. Negligible damage. - All small dents, free from cracks, abrasions and sharp corners, may be neglected. Larger dents should be restored to shape taking care to avoid cracking when effecting the repair. c. Damage Repairable by Patching. - For damage in eaeess of that in paragraph 1.b. above, use the repair data given in figure 118. Cut away all damaged area leaving a smooth-edged, regular-shaped hole |
with at least a 1/ 2 -inch radius in the corners. Patches must bed the same gage and material as the original construction. d. Damage Necessitating Replacement. - Any damaged section of the cowl which, due to its extent or location makes a repair impracticable, should be replaced. 2. Surface Controls. a. General. - No repairs should be made to the control mechanisms and cables. Replace if damaged in any way by standard spares( All cables must be of the corrosion-resisting type and must be replaced if frayed, see the Cable Chart of the section for replacement. If cloth is replaced on any of the control surfaces it should be attached to the ribs as shown by diagrams in figure 114. b. Pulleys.- Check all pulleys for proper alignment and signs of excessive wear and replace when necessary. All control pulleys are of the anti friction bearing type and replacements must be of the same nature. |
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