TM 5-6115-434-12 Table 3-5.  Sequence of events during performance check-Continued Step Condition Power unit Indication Adaptor indication Remarks 14 Place 400 Hz out- 400 Hz ac convenience put contractor receptacle and power switch in RESET output receptacles position and hold energized - Continued 15 Release 400 Hz 400 Hz main contactor K12 400 output con- If not, and environ- output con- relay (K10) remains tactor lamp stays il- mental control com- tactor switch. energized. luminated. ponents are also de- energized, there is probably a generator fault signal produced by connection of 400 Hz load. If not, but environmental control components remain energized, probably 400 Hz contactor switch (S9) failed or contacts of 400 Hz output con- tactor relay (K12) failed. e. Adjustments. (1) Acceleration      and    overtemperature  control  thermostat.    If  acceleration  and  overtemperature  control thermostat (fig. 3-9) is replaced, or if controlling temperature is not as specified, check and adjust as follows. (a) Connect  gas  turbine  engine  analyzer  to  power  unit  as  described  in  paragraph  3-8b  above  except paragraph 3-8b(6) above. (b) Disconnect line from load control thermostat (fig. 3-24).  Connect a control air plumbing line from the load control thermostat line to the AIR IN fitting on the analyzer panel.  Open needle valve on  analyzer panel (fig. 33). (c) Remove cap from acceleration limiter valve.  tee.  Connect the 0-100 psig gage set, provided with the analyzer, to the open leg of the tee. (d) Open   conditioned   air   outlet   compartment   access   door   (fig.   1-2)   and   refrigeration   compartment access door (fig. 1-1). (e) Start engine and accelerate to noload governed speed.  Operate at this speed for approximately two minutes to stabilize operation. (f) Operate both heated air systems at full heat as described in paragraph 2-16d. (g) With  heated  air  systems  operating  at  full  heat,  place  the  mode  select  switch  to  COOL  on  both systems.    The  heated  air  flow  control  valves  will  remain  open  but  the  engine  load  control  valve  will  close.    Open  the engine load control valve by installing a jumper between  analyzer   jacks   identified   LOAD VALVE and DC POWER. This condition delivers both cooled air and heated air at the same time to provide sufficient engine load to raise exhaust gas temperature to 671°C to 682°C (1240°F to 1260°F) for checking the thermostat setting. Caution This bypasses the over-temperature thermoswitches in the air out compartment.  Monitor the air out temperature and shut down the power unit if air discharge temperature exceeds 93  °C (200°F). (h) With  engine  operating  at  full  bleed  load,  slowly  close  needle  valve  (fig.3-3)  on  gas  turbine  engine analyzer panel until the AIR IN pressure gage (fig. 3-3) drops to approximately 14 psig.  The exhaust gas temperature at which  engine  speed  and  fuel  pressure  start  to  decrease  is  the  acceleration  and  overtemperature  control  thermostat controlling temperature. 3-28