What to look for in a prebuy?

[ljmolina]

Here is what I have so far... Anyone, please feel free to add to list of known skymaster problematic areas or issues.


 FUEL LINE LEAKS
-Look for Obvious Fuel Line Leaks

 OIL LEAKS
-REAR ENGINE notoriously known for oil leaks.

 FULL FUEL CHECK
-If you fill the tanks too fast the inner tanks does not fill as quickly as
the outer tank and can cause you to lose up to 12 gals.

 MAG CHECK REPLACED?
-Mags are good for about 300-400 Hrs
-Are they Pressurized Mags?

 FUEL PUMPS - need clarification
-something about setting fuel pump to LOW and if the engine needs
more fuel pressure, they automatically go HIGH?

 ENGINE MOUNTS
-Check engine mounts (especially the rear)

 ALTERNATOR
-Check Alternator drive couplings for slippage. The wear out before
TBO, and can cause Internal Engine Damage.

 VACCUM PUMPS
-Most of the time they are 300 hrs pumps and need serviced.

 LANDING GEAR DOORS
-Check for gear door droop. If they do, the Gear Accumulator is bad
(located near under the pilot seat)
-Manually Cycle the Gear

 LANDING GEAR POWERPACK
-Top off with Hydraulic Fluid (behind center pedestal)


IN FLIGHT

 POWER ON TAKE-OFF
-Make sure the Power Red Lines on take-off

 JANITROL HEATER
-Verify functioning (Just replaced / refurbished)

 FUEL FLOWS
-Check that Fuel Flows Match

 THROTTLE POSITION
-Verify throttle positions are aligned

 GAUGES
-Make sure all gauges have correct readings.
-FUEL GAUGES ( Right Gauge was just replaced)
-OIL PRESSURE
-ENGINE TEMPERATURE

 ALTERNATOR FUNCTION
-Check each alternator
-Switch Front OFF (Verify the rear alternator picks up the load and
Warning Light) then, back ON
-Switch Rear OFF (Verify the front alternator picks up the load and
Warning Light) then, Back ON

 CABIN PRESSURE CHECK
-Take Plane upto 17,500 ft and ISOLATE each engine and check to see if
the cabin pressure can maintain max differential pressure (3.25psi)

 AUTO PILOT
-Verify Altitude HOLD
-Verify Heading HOLD

 NAVIGATION
-VERIFY VOR / ILS functionality