aircraft mumber and side with ink marking pen on forward half of holder outer frame, Assembled paper and holders may be stored by carefully wrapping in clean heavy paper sealed with tape to be dust-tight. Outside of package should be marked to identify contents, The serial number of filter holder and aircraft in which installed should be permanently recorded for each shot with copy to 11,2 Project Officer, 2.2 Installations, 2.2.1 In general, filter holders may be installed the evening before shot time, but if delay seems probable or weather is very rainy, holders should be installed at last convenient moment. Caution: Moisture greatly weakens the filter material, Before installation of holder, filter unit should have been thoroughly decontaminated, rinsed with pure water, and dried, After being cleaned, it should be kept clean by use of plastic cover or tape covering inlet hole and exit slot. Cover should be kept on after holder has been installed to prevent contamination until just before take-off when airplane is in take-off position, Caution: Pilots should avoid taking-off in jet blast or exhaust of preceding aircraft. Holder is inserted with 1/h inch mesh positioned to the aft side of slot in unit. Care mst be taken to insure that filter material does not move down from supporting frame edge because filter failure will result, Holder should be inspected through exit slot for such movement of paper. After insertion, holder is fastened with safety wire across slot in the case of the F-8)G airplane or by closing stress latches on the B-S7B unit. Caution: Do not pinch or cut wire on F-8L,G unit or it may fail and filter holder may fall out o landing roll, Caution: Stress latches on B-57B unit must be carefully adjusted or they may open on take-off or landing and holder may fall out, If filter unit is flown at high speeds with latches open structural failure may result, 3.0 Removal, 3.1 Preparation. 3.1.1 Aircraft Parking, 221 AFWL/HO SWEH-2-003),