TM 55-1510-222-10 CAUTION • Engine   operation   using   only   the engine-driven   fuel   pump   without boost pump fuel pressure is limited to 10 cumulative hours.  All time in this  category  shall  be  entered  on DA  Form  2408-13  for  the  attention of maintenance personnel. • Use   of   aviation   gasoline   is   time- limited  to  150  hours  of  operation during any Time-Between-Overhaul (TBO)  period.    It  may  be  used  in any quantity with primary or alternate fuel. 5-14. OVERTEMPERATURE AND OVERSPEED LIMITATIONS. a. Whenever   limiting   temperatures,   listed   in   the Engine   Operating   Limitations   chart   (Table   5-1),   are exceeded   and   cannot   be   controlled   by   retarding   the power levers, the engine will be shut down and a landing made as soon as possible. b. During   engine   starting   the   temperatures   and time   limits   listed   in   the   Engine   Operating   Limitations chart (Table 5-1) must be observed.  When these limits are exceeded, the incident will be entered as an engine discrepancy in the appropriate maintenance forms.  It is particularly important to record the amount and duration of over temperature. c. Whenever    the    prescribed    engine    overspeed limit  or  engine  RPM  operating  limit  is  exceeded,  the incident  must  be  reported  as  an  engine  discrepancy  in the  appropriate  maintenance  forms.    It  is  particularly important   to   record   the   maximum   percent   of   RPM registered    by    the    tachometer,    and    the    duration    of overspeed. d. Continued   engine   operation   above   810°C   will reduce engine life. 5-15. POWER DEFINITIONS FOR ENGINE OPERATIONS. The   following   definitions   describe   the   engine   power ratings. a. Takeoff Power. The maximum power permissible, limited to periods of five minutes duration. b. Maximum Continuous Power. Maximum continuous power is the highest power rating not limited by  time.    Use  of  this  rating  is  intended  for  emergency situations at the discretion of the pilot. 5-16. GENERATOR LIMITS. Maximum    generator    load    is    limited    for    flight    and variable  during  ground  operations.    Observe  the  limits shown in Table 5-2 during ground operation. Table 5-2.  Generator Load Limits GENERATOR LOAD MINIMUM GAS GENERATOR RPM N₁ 0 to 95% 65% 95 to 100% 70% BT00107 5-7