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SELECTING THE PROPER MICROMETER
General Arrangement of Mk7 Arresting Engine with Cooler

Aviation Boatswains Mate E - Aviation theories and other practices
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CHAPTER 3 MK 7 AIRCRAFT RECOVERY EQUIPMENT Present-day aircraft normally require the use of runways that are 5,000 to 8,000 feet long in order to land ashore. On an aircraft carrier, these same aircraft are stopped within 350 feet after contacting the deck. This feat is accomplished through the use of aircraft recovery equipment, including an emergency barricade that brings a landing aircraft to a controlled stop by absorbing and dispelling the energy developed by the landing aircraft. This recovery equipment is commonly called arresting gear. The sole purpose of an aircraft carrier is to provide a   means   of   launching   a   strike   against   an   enemy anywhere in the world. After the aircraft complete their mission,  the  carrier  must  provide  a  means  of  safely recovering them. The Mk 7 arresting gear provides this means. AIRCRAFT RECOVERY LEARNING OBJECTIVE: Describe aircraft arrestments  aboard  aircraft  carriers.  Describe prerecovery    preparations.    Describe    normal aircraft recovery operations. Describe emergency aircraft recovery operations. Aircraft  arrestments  aboard  carriers  are  classified as   either   a   normal   arrestment   or   an   emergency arrestment. Simply stated, arrestment is accomplished in  the  following  manner:  the  arresting  hook  of  the incoming  aircraft  engages  a  wire  rope  cable,  called  a deck pendant, that spans the flight deck in the landing area. The force of the forward motion of the aircraft is transferred to purchase cables that are reeved around a movable   crosshead   of   sheaves   and   a   fixed   sheave assembly  of  the  arresting  engine  (see  fig.  3-1).  The movable  crosshead  is  moved  toward  the  fixed  sheave assembly  as  the  aircraft  pulls  the  purchase  cables  off the  arresting  engine,  forcing  a  ram  into  the  cylinder holding  pressurized  hydraulic  fluid  (ethylene  glycol). This fluid is forced out of the cylinder through a control valve that meters the flow to an accumulator until the aircraft  is  brought  to  a  smooth,  controlled  arrested landing (see fig. 3-2). After  arrestment,  the  aircraft's  arresting  hook  is disengaged  from  the  deck  pendant.  A  retract  valve  is then  opened,  allowing  fluid  to  be  forced  from  the accumulator back into the engine cylinder, forcing the ram  out.  As  the  ram  moves  out  of  the  cylinder,  the crosshead   is   forced   away   from   the   fixed   sheave assembly,  pulling  the  purchase  cables  back  onto  the engine until the crosshead is returned to its BATTERY position  and  the  crossdeck  pendant  is  in  its  normal position on the flight deck. PRERECOVERY PREPARATIONS Prior to recovery of aircraft, all recovery equipment and landing area must be made ready and all personnel properly positioned. The following is a general listing of  the  events  that  must  be  accomplished  prior  to  the recovery of aircraft:   All operational retractable sheaves raised to the full up position   All   aft   deckedge   antennas   positioned,   as required   Ready  barricade,  including  deck  ramps,  in  a ready status with a clear route to the landing area and a tractor with driver standing by   All  launching  accessories  clear  of  the  landing area   Appropriate  catapult  shuttle(s)  (as  applicable) are  aft  with  the  grab  latch  disengaged  and  the shuttle spreader cover installed   The  catapult  centerdeck  hatch  and  any  other hatches  in  the  waist  catapult  area  closed  and dogged down   Jet Blast Deflectors (JBDs) completely lowered and hydraulics secured   Waist catapult safety light in the down position, if applicable   Catapult #3 track slot buttons installed   Waist    catapult    Integrated    Catapult    Control Station (ICCS) fully lowered, if applicable 3-1







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