| AN 01-25CN-2 | PARAGRAPH 1 |
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(6) GUN MOUNT-The guns are mounted in the wing by front and rear adapters. The front adapter is attached to a support on web 3 by one bolt and the rear adapter is attached to a support on web 5 by one bolt. (7) GUN ADJUSTMENT-Horizontal and verttcal gun adjustments are made at the rear gun mount. Vertical adjustments are made by loosening the two locking bolts which clamp the serrated locking plates in position. Move the gun up or down to the desired setting and tighten nuts to lock the serrated plates in position. Horizontal adjustments are made by loosening the two set screws holding the rear gun mount adapter in place on the lateral adjusting sleeve. Turn the rear mounting bolt, which has a flat side to key it to the lateral adjusting sleeve, until the required setting is obtained. Hold in position by tightening the set screws. The guns may be adjusted vertically, from a position parallel to the line of flight of the airplane at high speed at the best performing altitude with full load less one-half of the fuel load, to a position parallel to the line of flight at 15% below the high speed under the same conditions. All settings are corrected in accordance with H39G3939. The vertical gun setting angles with respect to the gun leveling lugs are as follows:
The lateral setting is from the convergence of fire at 200 yards to a position parallel to the center line of the fuselage, or approximately from 0° 37 minutes inboard from a position parallel to the center line of the fuselage. The adjustments for various flying conditions are given on the gun sighting chart. (See Fig. 116.) (8) WING GUN INSTALLATION-To install the wing guns, proceed as follows: (a) Install the rear adapter on the gun. The saddle over the gun for the tie-down arrangement should be installed with the largest overhang on the outboard side for each gun. Adjust the tie-down rod for proper tension with the toggle in the locked position. Do not tighten excessively, or damage may result. Adjust the lower nut on the tie-down rod so that it will be approximately 1/16 inch below the saddle. The purpose of this lower nut on the tie-down rod is to keep the tie-down mechanisim intact when it is released by the |
toggle and swung out of position. (b) Install blast tube retainers as follows: 1. Screw the retainer in the blast tube until it shoulders. 2. Slip the assembled blast tube over the gun muzzle and onto the barrel jacket until it shoulders. 3. Rotate the assembled blast tube until the threaded holes in the retainer align with the slots or holes in the gun barrel jacket. If the gun has 2 slotted jacket, three threaded holes in the retainer must register with slots. If the jacket has round holes, two threaded holes in the retainer should register with holes in the jacket. (See note 1.) 4. Assemble the studs in the retainer, small diameter heads inside for the slotted jacket and large diameter heads inside for the roundhole jacket. (See note 1.) 5. Set the studs tight, and then back off approximately one-half turn, leaving the studs with slots at right angles to the gun axis. The studs must secure the retainer in all directions. 6. Lock wire through the slots in the studs and around the retainer.
(c) Unbutton the gun-access door. (d) Install the front adapters in the gun compartment, but do not tighten the yoke nut, so that the adapter may be lined up correctly with the gun upon installation. Be sure that the locking plates are installed in all adapters, |
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