Meno for: Director of Operetions (Cont'd) 10 Apr 54 As an additional safety measure one covld provide spoilers on the lifting surfaces of the parked aircraft. It is questionable whether the effort can be justified, harever, For tacticcl or cargo aircraft up to about one hundred foot wingspan, one or more two by fours could be tied to the upper surfaces across the span, For larger aircraft, rows of sand begs might be employed, perhaps in two courses, 5. In order to probe the aircraft damage problem further, the question of higher overpressures was discussed, The only oninion they were willing to stite was thet overoressures higher than .7 psi would carry with them an increasing risk of denage, and that -t 1.0 nsi or above, some damage ves to be expected, 6. In order to take advantage of the planving done during Operation IVY for protection egainst the effects of the MIKE detonation, the "Final Report of JTF 132", and the "History of Operation IVY" were consulted, These documents ere available through Classified Files at JIF SEVE!, information availebdle there was as follows: ee, H19's were evacueted to the RENDOVA, bd, H-+13's were crated and stored on FRED, ec. Some of the L-13's were tied down and sand bagzed, dad. The balance of the L-13's vere secured with their wings foldcd, of extent of the sand begzing vas not described. 7. The =ah « The nature To obtain what informetion w:.s available concerning protection of and damage to the hangar on MIKE si:ot, Mr, Coray, Holnes °. Narver Project if-nazer, and Mr. Boettcher, of ingineering Division, Holues ¢& ilarver, were contactec., Althoush the rceords ere not coupletc, it war determined thet the hanger doors wcre bloced open, and that columms tere installed to suport the roof, Hovever, the loads imocsec om the structure by the shock hitting it from the north side, and then sweeping inside from both cnds was such as to lift the roof, and Icave sane smcll anowit of permenent set in the structure, This deflection allowed one or tio doors to come free of the tracks, and fall, The only repeir necessary on the building vas to realign the door tracks. SG. Further discussion brought forth the fret thet no plens are being matic for protection of even critical scicntific laboratory; buildings. It hasbeow docided to accept damage and exsond funds on rencir, rather than spend large amounts on storing and tying down buildings and protecting equipment, If this decision was.roached on the basis of the