TRAIL EDGE OF THE TROOP DOOR10-107. The JM will not stomp on the platform at any time when conducting door safety checks, and will apply firm downward pressure to the middle of the platform with the trail foot to ensure proper seating of the platform. Place the trail foot on the center of the platform with the lead foot a comfortable distance behind the trail foot.CAUTIONAll jumpmasters performing duties on a C-27J Spartan aircraft must be able to conduct a paratroop door check while maintaining three points of contact with the airframe. This check requires the jumpmaster to attain an 80-inch reach. Jumpmasters must be evaluated by their unit prior to performing any duties on this airframe.10-108. With the lead hand, trace the paratroop door starting at the middle portion of the top edge of the paratroop door and trace to the top of the trail edge, down to the jump platform, then back up to the middle of the top edge of the door. Once completed, secure a handhold with the lead hand by grasping the upper and lower litter support block. CAUTIONThe jumpmaster must be aware that without a wind deflector, the T-11R rip cord handle will be exposed to higher winds than with other fixed- wing aircraft and could cause inadvertent reserve parachute deployment. Minimize unnecessarily exposure of the reserve parachute to relative wind for extended lengths of time.INITIAL OUTSIDE AIR SAFETY CHECK10-109. The JM leans out by bending forward at the waist 90 degrees, keeping both heels flat, elbow bent, and maintaining a firm grasp on the seat back support rail and upper and lower litter support bracket with both hands, and performs an initial outside air safety check down and to the rear of the aircraft for any unsafe conditions. JMs are encouraged to conduct checks in all cardinal directions to maintain the best situational awareness.10-110. Once the initial clear to the rear is complete, the JM returns to a relaxed door position and looks at their jumpers, then the safety, comes to a rest position, and waits for the one-minute reference point. In the absence of reference points or checkpoints, the JM uses additional time advisories from the air crew, which must have been identified during the air mission briefing. The JM relays time warnings to the jumpers by leaning back inside the aircraft, keeping their foot centered on the platform, facing the jumpers, and calls off the one-minute and 30-second time warning while giving the proper arm-and-hand signal for each time warning.WARNINGAt no time will the jumpmaster lock their elbows out during the outside air safety check. Doing so could cause an inadvertent reserve parachute deployment.ONE-MINUTE WARNING10-111. Once the JM spots their one-minute reference point and is about one minute from the green light, or the safety passes along the loadmaster time warning to the JM: The JM relays the one-minute warning to the jumpers by leaning back, keeping their foot centered on the platform, facing the jumpers, and extends the index finger of their lead hand and announces, “ONE MINUTE.” The jumpers relay the time warning by looking over their shoulder closest to the skin of the aircraft, shouting “ONE MINUTE.” The JM continues observing outside for the 30-second reference point, or until the 30-second time warning is relayed from the loadmaster.