MIL-DTL-27443F (USAF)
3.5 Dimensions and weight. The nominal dimensions of the Type I pallet are: 88 x 108 x 2.250 inches
thick (see 4.5.1). The Type II pallet is 88 x 54 x 2.250 inches thick (see 4.5.1). The Type I pallet
maximum allowable weight is 300 pounds. The Type II pallet maximum allowable weight is 160
pounds.
3.6 Component preparation for assembly.
3.6.1 Preparation of balsa wood for bonding. Balsa wood core segments shall be oven-dried for 120
± 10 minutes at 225o ±5o F in preparation for bonding. Core segments shall be cleaned of dust with
dry, oil-free, filtered and compressed air or vacuum prior to delivery to lay up and assembly area.
Acceptable moisture content of balsa wood should be no higher than 12% at the time of bonding. If
higher, dry at 190-200°F or higher for one-hour minimum (see 4.5.1).
3.6.2 Preparation of skins and rails. Skins and rails shall be prepared for bonding in accordance with
Table 3 or Table 4 of ASTM E 864. Unless otherwise specified herein, preparation shall include all
necessary materials, apparatus, test methods, procedures, quality assurance, and certification(s)
specified in ASTM E864 (see 4.5.1).
3.6.3 Adhesive application. Adhesive shall be applied to skins and rails within 16 hours after drying.
Skins and rails which have not been coated within 16 hours shall be reprocessed as specified (see
3.6.2). Adhesive shall be applied to all balsa segments within 2 hours following oven drying. The
adhesive shall be uniformly applied in accordance with the manufacturer's instruction sheet as required in
MMM-A-132 (see 4.5.1).
3.6.3.1 Rail bond seat. Scrim tape impregnated with MMM-A-132 adhesive (FM-47) shall be
applied to the bond seat area of the assembled rails prior to assembling the skins. Vertical bond surface
of the rails shall also be coated with adhesive prior to assembly of balsa (see 4.5.1).
3.7 Assembly. Pallets shall be assembled according to applicable portions of drawings DL 7031843
and DL 7133047 (see 4.5.1).
+ 0.125
3.7.1 Corner sealant. A 0.531
x 45-degree chamfer shall be cut from 1 corner of the 4 core
-0
segments. The core sections shall be positioned within the interior perimeter of the rail frame with the
chamfered corner of the core segment(s) positioned at the mitered corners. The sealant (MIL-PRF-
81733, Type II) shall be injected into the 4 corner cavities to completely fill the cavities. The sealant
shall be troweled level with the horizontal bonding surface at the mitered corners. The pallet assembly
shall be inspected for complete corner cavity fill with sealant prior to assembly of top facing.
3.7.2 Press fabrication. A metal sheet or pressure padding sheet shall be placed between the surfaces
of the pallet and the press plate to ensure even distribution of pressure and overall contact between the
surfaces to be bonded.
9
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business