12/15/2023 0 Comments Canopy jettison system diamond star![]() ![]() The bleeder valve also has a manual override that permits bleedoff of nitrogen pressure after jettison system testing as required during periodic inspections. Date of Issue HK 36 TTS : Rotax 914 F3 or 914 F4 : HK 36 TTS : SF 3/82 : 3.01.15-E : Pages identified by 'ACG-appr. The bleeder valve will reopen when the pressure in the system is reduced below 40 psi. Diamond AIRCRAFT AIRPLANE FLIGHT MANUAL FOR THE POWERED SAILPLANE Engine Model Serial No. When an air release valve is actuated, the bleeder valve closes and remains closed throughout the jettison operation. The vent bleeder check valve is normally open at 40 to 80 psi. The valve is located downstream of the three air release valves and vents any low-pressure nitrogen that may have leaked past the air release valves, thus preventing inadvertent cartridge actuation. The vent bleeder check valve is located on the forward side of the left boarding ladder well. The gauge is tapped into the pressure line between the air bottle and the cockpit air release valve. The air gauge provides a means of checking proper system precharge. The valve cracks to relieve pressure at 3,800 psi and reseats at 3,400 psi. The relief valve prevents excessive air bottle pressure increases due to thermal expansion and over- pressurization during charging. SYSTEM COMPONENTS The main components of the canopy jettison system are shown in figure 2-6. To manually release the canopy actuator from the canopy attachment, pull either of the manual release handles located under access doors on the aft end of the canopy shell or the single manual release handle located on the canopy overhead center beam. 2-7) and fires the pneumatic jettison cartridge. Opening any one of these valves directs nitrogen pressure from the bottle to the canopy actuator cap assembly (fig. One valve is actuated from the cockpit, the other two by their respective RESCUE handle on the engine intake air ducts. Three air release valves are installed in the air- craft for jettisoning the canopy. The jettison cartridge is fired by pneumatic pressure from a small (14.6 cu in.) air bottle pressured with nitrogen to 2,450 psi at 70☏ prior to takeoff. When the cartridge is fired, expanding gases create the necessary pressure to unlock the jettison sleeve from the rod end and force it and the canopy aft and off the aircraft (fig. Passages within the canopy actuator connect to a jettison cartridge that is mounted on the side of the cylinder head end. In the A-6, a jettison sleeve is housed in the canopy actuator rod. The actuator is equipped with a mechanical torque limiter that prevents damage to the actuator if excessive torque is applied to the manual backup control mode.Using the ejection seat require ejection through the canopy unless special conditions dictate a deviation is necessary. The brake engages to hold the canopy at any position when manual cranking is stopped. Manually operating the canopy overrides the mechanical brake in the canopy actuator. A 3/8-inch drive tool is inserted into the drive receptacle and turned 351 turns counterclockwise to open the canopy or clockwise to close the canopy. By operating the drive unit internally or externally, mechanical motion is transferred through the shaft assembly to the canopy actuator.įigure 2-9.-Canopy electrical system schematic.įigure 2-9.-Canopy electrical system schematic-Continued.Īs previously stated, the canopy external manual drive receptacle is provided to operate the canopy actuator manual drive unit from outside the cockpit. The internal manual canopy opening handle shaft assembly mechanically links the drive unit to the canopy actuator. The handle is turned 701 turns clockwise to close the canopy or counterclockwise to open the canopy. The handle is removed from its stowage receptacle and clip, and then it is inserted into the crank socket. The canopy actuator manual drive unit is operated from inside the cockpit by using the internal manual canopy opening handle. The backup manual control mode is used to open and close the canopy when utility battery power is low, internal or external electrical power is not available, or a failure has occurred in the canopy actuation control system. ![]()
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