The actual trim check would be done based on a temperature  and pressure, such as the example in  Figure 8-15.  For these  given temperature and pressures, the target parameter values  can be derived from a chart in the manufacturer’s manual.  The engine is run up, and these values are checked against  the tolerances given in the manual.  Since most turboprop powerplant removal and installation  instructions are developed for QECA, the following procedures  reflect those used for a typical QECA. The procedures for  turboprop engine removal and installation are similar to those  presented in the section of this chapter for turbojet engines,  except for those systems related to the turboprop propeller. Open the engine side panels and remove the nacelle access  panels. Disconnect the engine thermocouple leads at the  terminal board. Before disconnecting any lines, make sure  that all fuel, oil, and hydraulic fluid valves are closed. Plug  all lines as they are disconnected to prevent entrance of  foreign material. Remove the clamps securing the bleed-air ducts at the firewall.  Then, disconnect the electrical connector plugs, engine  breather and vent lines, and fuel, oil, and hydraulic lines. Disconnect the engine power lever and propeller control rods  or cables. Remove the covers from the QECA lift points,  attach the QECA sling, and remove slack from the cables  using a suitable hoist. The sling must be adjusted to position  the hoisting eye over the QECA CG. Failure to do so may  result in engine damage. Remove the engine mount bolts. The QECA is then ready  to be removed. Recheck all of the disconnect points to make  certain they are all disconnected prior to moving the engine.  Move the engine forward, out of the nacelle structure, until  it clears the aircraft. Lower the QECA into position on the  QECA stand and secure it prior to removing the engine sling. The installation procedures are essentially the reverse of  the removal procedures. Move the QECA straight back into  the nacelle structure and align the mount bolt holes and the  firewall. Start all the bolts before torqueing. With all the  Turboprop Powerplant Removal and  Installation Figure 8-15.  Trim check data (Boeing).  8-16 ASSUME SELECT TRIM TARGETS FOR THE FOLLOWING 1. Ambient temperature: OAT = 12 °F 2. Barometric pressure = 29.0 inches of mercury 1. Minimum idle (%N2) is 57.7 (+1.5/−0.5)%N2 2. Approach idle (%N2) is 67.6 ±0.5 %N2 3. 2.5 bleed open inc (%N1) 60.4 ±0.5 %N1 4. 2.5 bleed closed inc (%N1) is 63.5 ±0.5 %N1 5. Takeoff (EPR) is 1.50 +0.01/−0.00 EPR 6. 95% takeoff thrust (EPR) is 1.46 EPR 7. 90% thrust change deceleration (EPR)  is 1.04 EPR Barometer (inches of mercury) DAT °F (°C) Trim targets 12 (−11) 16 (−9) 20 (−7) MIN IDLE (%N2) APP IDLE (%N2) 2.5 BLEED OPEN INC (%N1) BLEED CLOSED INC (%N1) TAKEOFF (EPR) 95% TAKEOFF THRUST (EPR) 90% THRUST CHANGE DECEL (EPR) MIN IDLE (%N2) APP IDLE (%N2) 2.5 BLEED OPEN INC (%N1) BLEED CLOSED INC (%N1) TAKEOFF (EPR) 95% TAKEOFF THRUST (EPR) 90% THRUST CHANGE DECEL (EPR) MIN IDLE (%N2) APP IDLE (%N2) 2.5 BLEED OPEN INC (%N1) BLEED CLOSED INC (%N1) TAKEOFF (EPR) 95% TAKEOFF THRUST (EPR) 90% THRUST CHANGE DECEL (EPR) 31.0  30.0  29.0  28.0  27.0  26.0  25.0  24.0  23.0  22.0  57.6  67.5  60.4  63.5 1.45 1.42  1.03  57.9  67.8  60.6  63.8 1.45 1.42  1.03  58.1  68.1  60.9  64.0 1.45 1.42  1.03  57.6  67.5  60.4  63.5 1.48 1.45  1.03  57.9  67.8  60.6  63.8 1.48 1.45  1.03  58.1  68.1  60.9  64.0 1.48 1.45  1.03  57.7  67.6  60.4  63.5  1.50 1.46 1.04  58.0  67.9  60.6  63.8  1.50 1.46 1.04  58.2  68.2  60.9  64.0  1.50 1.46 1.04  58.0  67.7  60.4  63.5  1.51 1.47 1.04  58.2  68.0  60.6  63.8  1.51 1.47 1.04  58.5  68.3  60.9  64.0  1.51 1.47 1.04  58.3  67.8  60.4  63.5  1.53 1.48 1.04  58.5  68.1  60.6  63.8  1.53 1.48 1.04  58.8  68.3  60.9  64.0  1.53 1.48 1.04  58.6  67.9  60.4  63.5 1.54  1.50 1.04  58.8  68.2  60.6  63.8 1.54  1.50 1.04  59.1  68.5  60.9  64.0 1.54  1.50 1.04  58.9  68.0  60.4  63.5  1.56  1.51 1.04  59.2  68.3  60.6  63.8  1.56  1.51 1.04  59.4  68.6  60.9  64.0  1.56  1.52 1.04  59.5  68.3  60.4  63.5 1.57  1.52 1.04  59.8  68.6  60.6  63.8 1.57  1.52 1.04  60.0  68.9  60.9  64.0 1.57  1.52 1.04  60.2  68.8  60.4  63.5 1.59  1.53 1.04  60.4  68.9  60.6  63.8 1.59  1.53 1.04  60.7  69.2  60.9  64.0 1.59  1.53 1.04  60.9  69.0  60.4  63.5  1.61 1.54 1.04  61.2  69.3  60.6  63.8  1.61 1.54 1.04  61.4  69.6  60.9  64.0  1.61 1.54 1.04