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原文：
DIAGRAM: Number 1 HEAT RESISTANT TILES The tiles protect the shuttle from searing heat during reentry. Tiles under Discovery's nose cap have been structurally reinforced to help withstand stress and improve bonding. These tiles later will Mud Valves be replaced with a reinforced carbon material. Thousands of other tiles already have been replaced. MIKE WRIGHT/SENTINEL DIAGRAM: Number 2 CREW ESCAPE MEASURES A blowout side hatch and telescoping escape pole have been added to the crew compartment. Astronauts can now hook themselves to the pole and parachute to safety in certain emergencies after the boosters and external tank have been ejected and the shuttle is gliding at about 25,000 feet. AUXILIARY POWER UNITS. These units, each about the size of two car batteries end to end, provide hydraulic power for steering and landing. Discovery's APU's have minor modifications, but new units available soon will have improved parts to be more reliable and have a longer operating life. MIKE WRIGHT/SENTINEL Reducing Valves DIAGRAM: Number 5 (Red) MAIN LANDING GEAR The stopping ability of the landing gear has been increased about 15 percent. Brake parts have been thickened to resist heat damage and dangerous lockup. Landing gear axles have been made thicker to reduce brake damage and to cut down tire wear. MIKE WRIGHT/SENTINEL DIAGRAM: Number 6 ORBITAL MANEUVERING SYSTEM AND REACTION CONTROL SYSTEM VALVES. The 64 valves in these steering systems now include a "sniff" line for each valve to check for leaks of nitrogen tetroxide and monomethyl MIKE WRIGHT/SENTINEL DIAGRAM: Number 7 PRIMARY REACTION CONTROL THRUSTERS These thrusters help steer the shuttle in orbit. An automatic emergency shutoff system was added to stop the thrusters from firing if they start to operate uncontrollably and burn through their surrounding walls. MIKE WRIGHT/SENTINEL DIAGRAM: Number 8 (Red) 17-INCH ORBITER/EXTERNAL TANK DISCONNECT VALVES The valves prevent leakage of propellants from the external tank or orbiter when the external tank is ejected 8 1/2 minutes into flight. An Forged Steel Valves was added in each line to prevent the valves from accidentally closing while the engines are firing. This new metal latch moves to allow the valves to close at the proper time.
原文来自： http://pqasb.pqarchiver.com/orlandosentinel/access/89208706.html?dids=89208706:89208706&FMT=ABS&FMTS=ABS:FT&type=current&date=Sep+11%2C+1988&author=John+J.+Glisch+and+James+Fisher+of+the+Sentinel+Staff&pub=Orlando+Sentinel&desc=THE+MOST+WORRISOME+PARTS+THE+17-INCH+DISCONNECT+VALVES.&pqatl=google

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译文：发射的发动机的阀门
根据发现的鼻子帽砖结构已经加强，以帮助承受压力和改善粘合。以后将加强与这些碳材料取代瓷砖。数以千计的其他瓷砖已被取代。迈克赖特/哨兵图：2号船员逃生措施的井喷侧舱门逃生和伸缩杆已被添加到船员舱。宇航员可以挂钩后的助推器和外部燃料箱自己的杆位，在某些紧急情况下的降落伞被弹出的安全和航天飞机迈克赖特/哨兵图：编号3的MID，机身带的变化，特别是在航天飞机的中段安装提供额外的结构强度。阿橡胶材料也被添加到更安全地发布到机身底部的热在重返大气层。迈克赖特/哨兵图：4号（红色）辅助动力装置。每年约有两个电瓶年底大小这些部队，以结束，提供指导和着陆液压动力。发现的辅助动力装置的有小的修改，但提供的新单位很快就会改善的更可靠，具有更长的使用寿命。第5号（红色）主要齿轮的起落架着陆能力阻止了大约15个百分点。制动部分已经加厚抗热损伤和危险死机。起落架轮轴已厚一些，以减少刹车的损害和减少轮胎的磨损。迈克赖特/哨兵图：6个轨道机动数系统和反应控制系统阀门。这些转向系统的64个阀门，包括一系列“嗅出”每个阀门线为氮氧化物和甲基检查燃油泄漏在地面行动。 7号主反应推进器，这些推进器的帮助引导航天飞机在轨道上。自动紧急关断系统，将阻止射击，如果他们开始运作失控，烧毁通过围墙的推进器。迈克赖特/哨兵图：8号（红色）17英寸轨道飞行器/外部燃料箱拆线阀阀门防止外部燃料箱或外部燃料箱被弹出8 1轨道的推进剂泄漏/进入飞行2分钟。造成阻碍的latch的每一行中添加，以防止意外关闭，同时发射的发动机的阀门。这一新举措的金属锁，使阀门

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