Eddie Sez:

There is a lot to this checklist and it helps to carry a printed version with you every now and then just to make sure you aren't getting lazy. (I do this once a month and am always surprised by what my subconscious has decided to drop from the checklist.) You should certainly use the printed checklist following aircraft maintenance. More about this: Mishaps / GV N777TY.

Everything here is from the references shown below, with a few comments in blue.


Procedure

[G450 Airplane Flight Manual §2-01-20]

  1. Wheel Well Doors Open
  2. AOA Probe / Vane — Cover Removed / Check
  3. L TAT Probe — Cover Removed / Check
  4. Static Ports — Cover Removed / Check
  5. Ice Detection Probe — Check
  6. Standby Pitot Probe — Cover Removed / Chk Damage / Corrosion
  7. Forward External Switch Panel Door — Switches Off / Door Secure
  8. We have discovered the door can be closed even with the guarded battery switch on, so you have to check the battery switch off.

  9. Radome / EVS Window — Check
  10. Pitot Probes — Covers Removed / Chk Damage / Corrosion
  11. Windshield — Check
  12. Nose Landing Gear (NLG) Wheel Well Area — Check
  13. NLG Uplock — Open
  14. Parking Brake Accumulator — Check (3000 PSI)
  15. Emergency Landing Gear Extension Bottle — Check (3100 PSI)
  16. NLG Safety Pin — Remove
  17. NLG Door Control Valve — Pin Removed / Flight Pos. / Cover Secure
  18. NLG Fairing Door / Electrical Wires / Strut — Check
  19. Nose Wheel Steering Unit Overtravel Ind — Check
  20. You should also ensure the mooring tie down is full down and safety wired to the strut. Why? See: Gulfstream Journal April 25, 2014, "GII-G550: Amber Main Gear Door Open, L-R, Message after Gear Retraction.

  21. Taxi Lights / NLG tires — Check
  22. NLG Torque Link — Pinned / Saftied
  23. NLG WOW Switch — Check
  24. The nose gear WOW should have a thin gap. The weight on wheels switch is right of center and teh steerling link cable can get in the way if routed under the steering link, so rout at least the right cable above the steering link.

  25. Ice Detection Probe — Check
  26. Static Ports — Cover / Removed Check
  27. AOA Probe / Vane — Cover / Removed Check
  28. R TAT Probe — Cover Removed / Check
  29. Pressure Relief Valve / TROV / Vortex Generator — Clear / Check
  30. External DC Power Door — Check / Secure
  31. External AC Power Door — Check / Secure
  32. PRV Static Ports — Cover Removed / Checked
  33. Oxygen System Overboard Discharge Disk — Intact
  34. [G450 Aircraft Operating Manual, §2A-35-20, ¶2.F.] The disc seals the overpressure discharge vent line of the oxygen system. If pressure within the bottles exceeds twenty-six hundred (2600) psi through overfilling or if the temperature of the bottles reaches two hundred twenty-five degrees Fahrenheit (225°F) or one hundred seven degrees Celsius (107°C), an overpressure valve on the tanks will open, releasing oxygen into the overpressure vent line and rupturing the green plastic disc sealing the line.

  35. Oxygen Quantity — Checked
  36. The AFM now says 1500 psi is the minimum quantity, but we are told that is going to change to "recommended." If that happens, you should check the only chart that considers passengers and crew in G450-OMS-02, pg. A-12, to find a true minimum quantity. You can find that chart and more at: G450 Systems / Oxygen.

  37. Oxygen Service Door — Secure
  38. Antennas — Check
  39. Right Ice Inspection / Emergency Lights — Check
  40. Window Emergency Releases / Windows — Secure
  41. Right Landing Light — Check
  42. Wing Vent — Clear
  43. Engine Inlet / Cooling Inlet — Cover Removed / Check
  44. Fuel Servicing Panel / Door — Check / Door Secure
  45. Fuel Sump Drains — Check / Not Leaking Fuel
  46. Beacon — Check
  47. Pressure Fueling Static Port — Clear
  48. Wing Leading Edge - Check
  49. Fuel Tank Vent and Vortex Generator — Check
  50. Looking inside the NACA vent you may notice an uneven gap around the connector from the vent tube to the NACA scoop. About that . . .

    There is a round connector from the vent tubes that comes in from an odd angle from the wingtip. That connector has to mate with an adaptor that ends in the rectangular vent. Everything is strapped down and the outer "nut" is safety wired. I've run my finger around this thing, suspiciously, because even from inside the wing it appears to have more of a gap inboard than outboard.

    Is there something to worry about here? I don't think so. When the wing is filled this entire assembly is submerged in fuel. If the gap was real, you would get fuel seeping from the NACA vent whenever the tanks are full.

    Just to be sure, we've checked this on several aircraft and that thing that looks like a gap appears on most G450's. If you are worried about it, top off your tanks and shine your flashlight up the vent. Me? I'm not worried about it (anymore).

  51. Fuel Tank Plenum Drain — Check
  52. NAV / Strobe Light / Wing Tip — Check
  53. How do you know if the strobe is okay? See: G450 Systems / Strobe Light Fault Indicator.

  54. Winglet — Check
  55. Static Wicks (3) — Check
  56. Aileron / Aileron Bungee / Flaps / Spoilers — Check
  57. Main Landing Gear Fairing Door / Strut — Check
  58. See G450 Systems / Landing Gear Tires for a discussion on tire conditions.

  59. MLG Brake Wear Indicators (Inboard / Outboard) — Check
  60. MLG Tires/ Brakes — Check
  61. MLG Wheel Flange Retaining Rings (Inboard / Outboard) — Check
  62. MLG WOW Switch — Check
  63. The WOW switch should be in contact with the cam:

    You should also ensure the mooring tie down is full down and the retaining spring intact. Why? See: Gulfstream Journal April 25, 2014, "GII-G550: Amber Main Gear Door Open, L-R, Message after Gear Retraction.

  64. MLG Side Brace Actuator & Sequencing Linkage — Check
  65. Flap Drive Rods — Check
  66. MLG Uplock — Open
  67. MLG Wheel Well Area — Check
  68. Cannon Plugs Inside MLG Wheel Well — Check

  69. Main Fuel Shutoff Valve Position — Verify Open
  70. Fuel Boost Pumps — Check / No Leaks
  71. Right main Landing Gear Door Control Valve — pin removed / flight position
  72. MLG Safety Pin — Remove
  73. Wing Anti-Icing Vents — Clear
  74. Engine Cowl / Accessory Door / Vents / Exhaust — Check / Secure / Clear
  75. APU Exhaust — Clear
  76. Precooler Exhaust — Clear
  77. Heat Exchanger Exhaust — Clear
  78. Aft Fuselage Antennas — Check
  79. Elevator / Rudder / Static Wicks — Check
  80. Tail Cone Navigation Light / Static Wick — Check
  81. The manuals don't tell you to check it, but there is a tail cone strobe light and it has a fault indicator, just like the wing tips.

    How do you know if the strobe is okay? See: G450 Systems / Strobe Light Fault Indicator.

  82. Heat Exchanger Exhaust — Clear
  83. Precooler Exhaust — Clear
  84. Engine Cowl / Accessory Door / Vents / Exhaust — Check / Secure / Clear
  85. GND PWR RCPT Circuit Breaker — Check
  86. GND SVR BUS Switch — ON
  87. GND SVR Bus Indicator — CHECK
  88. UTILITY LIGHTS Switch — ON
  89. Right Battery Charger — Check
  90. Hydraulic Replenisher Fluid Level / Manual Selector Valve / Pump Switch — CHECK FLUID LEVEL / VALVE OFF / SWITCH OFF
  91. Hydraulic System Reservoir Quantity — CHECK (AT HYD RESERVOIR QTY INDICATOR)
  92. Oil System Reservoir Quantities — CHECK (AT FLUID QTY INDICATOR)
  93. Engine Oil Replenisher Fluid Level / Manual Selector Valve — CHECK / VALVE OFF
  94. Power Transfer Unit (PTU) DPI (1) — Check
  95. NOTE: Ensure DPI is flush. If DPI is popped, reset DPI and note time in logbook. Continued operation for the next fifty (50) flight hours is allowed. Check DPI prior to each flight.

    This is the only DPI on the airplane that gives you this kind of latitude.

  96. Right Hydraulic System Filter Differential Pressure Indicators (DPIs) (3) — CHECK
  97. It is common practice to reset any of these DPIs once if popped and not worry about it until it pops the second time. That is an improper practice. See G450 Systems / Hydraulics / DPIs for the reason why.

  98. Main Batteries (Left and Right) — CHECK
  99. APU Tailpipe — CHECK
  100. AUX Hydraulic Pump / DPI (1) — CHECK
  101. Look forward and to the left, this assembly sits underneath the aux pump itself. The DPI is seated in this photo, you can see the red of the top of the DPI if you stick your head closer. (The camera just couldn't make the angle.)

    It is common practice to reset this once if popped and not worry about it until it pops the second time. That is an improper practice. See G450 Systems / Hydraulics / DPIs for the reason why.

  102. AUX Power Relay Box CBs (6) — CHECK
  103. BLEED AIR Isolation Valve — CHECK
  104. Ozone Filters (Left and Right) — CHECK
  105. Air Conditioning Packs (Left and Right) — CHECK
  106. Left Hydraulic System Filter DPIs (5) — CHECK
  107. It is common practice to reset any of these DPIs once if popped and not worry about it until it pops the second time. That is an improper practice. See G450 Systems / Hydraulics / DPIs for the reason why.

  108. Left Battery Charger — CHECK
  109. Elevator Actuators (2) — CHECK
  110. Rudder Actuator — CHECK
  111. Somebody thought it was a good idea to require you check these, perhaps it is. I'm not so sure. But you really can't see any of these actuators without crawling underneath them.

    This checklist says "Elevator Actuators (2)" but other references say it is a "Elevator Dual Tandem Hydraulic Actuator." Whatever it is, it is on the right side of the aircraft in a tangle of hydraulic lines and other stuff. You aren't going to see the gizmo itself unless you position yourself right under it. You can get a better look in the G450 Illustrated Parts Catalog §27-34-05, Figure 1.

    The rudder actuator is the gizmo behind the bell crank. You can see it from forward, but just barely. You can get a better look in the G450 Illustrated Parts Catalog §27-23-05, Figure 1.

    Photo: Gust lock cable and springs under elevator / rudder assembly, from Eddie's aircraft.

    The book doesn't require it, but you should check the two gust lock springs and refuse the airplane if either is broken. Why? See: G450 Systems / Gust Lock.

  112. UTILITY LIGHTS Switch — OFF
  113. GND SVR BUS Switch — OFF
  114. Tail Compartment Ladder / Door — SECURE / CLOSE
  115. L / R Hydraulic Accumulators — CHECK (1200 PSI)
  116. Ground Service Panel Door — SECURE
  117. Aft Lavatory Service Door — SECURE
  118. External Air Access Door — CHECK / SECURE
  119. Aft Water Service Door — SECURE
  120. Baggage Door — SECURE
  121. Note: The door should be unlocked for flight — in the pictured, horizontal, position — to allow access by crash rescue if needed.

  122. MLG Wheel Well Area — Check
  123. Cannon Plugs Inside MLG Wheel Well — Check
  124. Main Fuel Shutoff Valve Position — CHECK
  125. Fuel Boost Pumps — Check / No Leaks
  126. Cockpit / Cabin Trim Air Valve Vent Elbow — Check/Clear
  127. Flap Drive Rods — Check
  128. MLG Uplock — OPEN
  129. MLG Side Brace Actuator & Sequence Linkage — Check
  130. MLG Fairing Door / Strut — Check
  131. MLG WOW Switch — Check
  132. You should also ensure the mooring tie down is full down and the retaining spring intact. Why? See: Gulfstream Journal April 25, 2014, "GII-G550: Amber Main Gear Door Open, L-R, Message after Gear Retraction.

  133. MLG Wheel Flange Retaining Rings (Inboard / Outboard) — Check
  134. See G450 Landing Gear Tires for a discussion on tire conditions.

  135. MLG Tires / Brakes — Check
  136. MLG Brakes Wear Indicators (Inboard / Outboard) — Check
  137. MLG Door Control Valve — Check
  138. Wing Anti-Icing Vents — Clear

    It isn’t in the checklist, but you checked the right vents, you might as well check the left...

  139. MLG Safety Pin - Remove
  140. Aileron, aileron bungee, flaps, spoilers - Check
  141. Static Wicks (3) - Check
  142. Winglet - Check
  143. NAV / Strobe Light / Wing Tip - Check
  144. How do you know if the strobe is okay? See: G450 Systems / Strobe Light Fault Indicator.

  145. Fuel Tank Plenum Drain — Check
  146. Fuel Tank Vent — Check
  147. Wing Leading Edge — Check
  148. Pressure Fueling Static Port — Check
  149. Fuel Sump Drains — Check / Not Leaking Fuel
  150. Engine Inlet / Cooling Inlets — Cover Removed / Check
  151. Window Emergency Releases / Windows — Secure
  152. Emergency Lights / Ice Inspection Lights — Check
  153. Landing Light — Check
  154. Wing Vent — Clear
  155. Main Entrance Door / Seal — Check
  156. Door Control Valve Pins / Landing Gear Safety Pins / Pitot Probe Covers — Stowed
  157. There should be three door pins:

    There should be three gear pins:


References

Gulfstream G450 Aircraft Operating Manual, Revision 35, April 30, 2013.

Gulfstream G450 Airplane Flight Manual, Revision 35, April 18, 2013

Gulfstream G450 Illustrated Parts Catalog, Revision 17, October 31, 2012

Gulfstream G450 Maintenance Manual, Revision 18, Dec 12, 2013

Gulfstream G450 Operating Manual Supplement, G-450-OMS-02, Extended Operations (ETOPS) Guide, Revision 2, April 2, 2009