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(a) The surface of the LZmuatbe level and free of obstructions srch as ditches, deep ruts, logs, fences, hedges, low shrubbery, rocks larger than s man's fist or grass over 1 1/2 feet In bstjht.
(t) The sub-soil-must be firm to a depth of 2 feet.
(c) A surface-containing gravel and small stones, cr thin layers of loose sand over a firm layer of sub-soil is acceptable. Plowed flelda or fields containing crops over 1 1/2 feet In height should not be used.
(d) Aa with DZ's surfaces that are not daslrable In summer may be ideal In winter. Ice with a thickness of 2 feet <61 centimeters} will support a medium aircraft. Unless the aircraft Is equipped for snow landing, snow in excess of 4 inches (ll centimeters) must be packed or removed from the landing
(e) Tbe heights of the obstacles are oomputed from the level of the Isnrttng strip. Where land falla away from the L2, objecta of oonalderable hetgt* may be ignored provided they do not cut the line of ascent or deaoent. This condition exists more often In mountainous terrain where plateaus are aelected for LZ'a o.
(1) For night operations lights are used for marking LZ's (during daylight, panels are used. When flashlights are need, they should be hand-held for directional oontrol and guidance.
(2) The pattern outlining the limits of the runway consists of five or seven marker stations (Figures 11 and 12). Stations "A" aad "3" mark the downwind end of the L2 and are positioned to provide for the safety factors previously mentioned. These stations represent the Initial point at which the aircraft ahould touch the ground. Station "C" indicates the very last point at which the aircraft can touch down and complete a safe landing.
(I) A signal station manned by tha RCL (a member of the operational d«-taohmant) la incorporated lata light station "BMattbe approach on downwtnd end of the L2 (Flforea 11 and 13). For night operations, (the algnal light operatloaa,) a distinctive panel or colored smoke, located approximately 13 meters to the left of etation "B" (RCL), la uaed for recognition.
(1) The LZ marking« are normally displayed 2 minute« before the arrival time Indicated In the mlaalon ooaflrmatlon message* The markings remain displayed for a period of < minute* or until the aircraft complete* landing roll after touchdown.
(2) Identification la accomplished by:
(a) Tha aircraft arriving at the proper time oa prearranged track.
(b) The reception oommittee leader dashing or displaying the proper oode algnal.
(3) Landing direction la Indicated by:
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