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9/27/01 AC 43.13-1B CHG 1 on the bottom side of the wings except where installed on the top surface by the original manufacturer. (1) Cutting the holes may be delayed until needed; however, all covers should be finished in matching colors with any trim lines and stored until needed. Spraying matching colors a year later is expensive and time con suming. (2) The 3-9/16 inch inside diameter cellulose acetate butyrate (CAB) plastic in spection access rings have become popular and bond satisfactorily with Nitrate Dope or Fabric Cement. Any metal inspection hole rein forcements of a particular shape or special de sign or size, installed by the original manu facturer, should be reinstalled after cleaning. (3) Tapes or patches over aluminum reinforcements are optional, but recommended in the prop-wash areas on the wings and for ward fuselage bottom. (4) Fabric patches over plastic rings are strongly recommended because plastic is not a stable material, becomes brittle at low tem peratures, and fatigues and cracks from prop blast vibration. Plastic rings are often cracked during removal and installation of spring, clip- held covers. Patches with a minimum 1-inch overlap, should be installed with dope. b. Drain Grommets. Atmospheric tem perature changes cause the humidity in the air to condense on the inside of aircraft surfaces and pool in all low areas. Rainwater enters through openings in the sides and top, and when flying, everywhere throughout the structure. Taxiing on wet runways also splashes water up through any bottom holes. Therefore, provisions must be made to drain water from the lowest point in each fabric panel or plywood component throughout the airframe while in a stored attitude. Drain holes also provide needed ventilation. (1) Install drain grommets on the under side of all components, at the lowest point in each fabric panel, when the aircraft is in stored attitude. Seaplane grommets, which feature a protruding lip to prevent water splashes through the drain hole, are recommended over drain holes subject to water splashing on land planes as well as seaplanes. The appropriate- size holes must be cut through the fabric be fore installing seaplane grommets. Plastic drain grommets may be doped directly to the fabric surface or mounted on fabric patches then doped to the covering. Installing a small fabric patch over flat grommets to ensure secu rity is optional. Alternate brass grommets are mounted on fabric patches, then doped to the fabric. (2) After all coating applications and sanding are completed, open all holes through flat drain grommets by cutting through the fab ric with a small-blade knife. Do not attempt to open drain holes by punching with a sharp ob ject because the drain hole will not remain open. 2-15.2-19. [RESERVED.] Par 2-14 Page 2-23 (and 2-24)PDF Image | AFS-640
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