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Exterior Preflight Checklist

Gulfstream Checklists


 

Procedure

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

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

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  13. Radome / EVS Window — Check
  14. Pitot Probes — Covers Removed / Chk Damage / Corrosion
  15. Windshield — Check
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  17. Nose Landing Gear (NLG) Wheel Well Area — Check
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  19. NLG Uplock — Open
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  21. Parking Brake Accumulator — Check (3000 PSI)
  22. Emergency Landing Gear Extension Bottle — Check (3100 PSI)
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  24. NLG Safety Pin — Remove
  25. NLG Door Control Valve — Pin Removed / Flight Pos. / Cover Secure
  26. NLG Fairing Door / Electrical Wires / Strut — Check
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  28. Nose Wheel Steering Unit Overtravel Ind — Check
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    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.

  30. Taxi Lights / NLG tires — Check
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  32. NLG Torque Link — Pinned / Saftied
  33. NLG WOW Switch — Check
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    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.

  35. Ice Detection Probe — Check
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  37. Static Ports — Cover / Removed Check
  38. AOA Probe / Vane — Cover / Removed Check
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  40. R TAT Probe — Cover Removed / Check
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  42. Pressure Relief Valve / TROV / Vortex Generator — Clear / Check
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  44. External DC Power Door — Check / Secure
  45. External AC Power Door — Check / Secure
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  47. PRV Static Ports — Cover Removed / Checked
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  49. Oxygen System Overboard Discharge Disk — Intact
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    [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.

  51. Oxygen Quantity — Checked
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    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 Oxygen.

  53. Oxygen Service Door — Secure
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  55. Antennas — Check
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  57. Right Ice Inspection / Emergency Lights — Check
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  59. Window Emergency Releases / Windows — Secure
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  61. Right Landing Light — Check
  62. Wing Vent — Clear
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  64. Engine Inlet / Cooling Inlet — Cover Removed / Check
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  66. Fuel Servicing Panel / Door — Check / Door Secure
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  68. Fuel Sump Drains — Check / Not Leaking Fuel
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  70. Beacon — Check
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  72. Pressure Fueling Static Port — Clear
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  74. Wing Leading Edge - Check
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  76. Fuel Tank Vent and Vortex Generator — Check
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    Looking inside the NACA vent you may notice an uneven gap around the connector from the vent tube to the NACA scoop. About that . . .

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    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).

  78. Fuel Tank Plenum Drain — Check
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  80. NAV / Strobe Light / Wing Tip — Check
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    How do you know if the strobe is okay?

    See: G450 Strobe Light Fault Indicator.

  82. Winglet — Check
  83. Static Wicks (3) — Check
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  85. Aileron / Aileron Bungee / Flaps / Spoilers — Check
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  87. Main Landing Gear Fairing Door / Strut — Check
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    See G450 Landing Gear Tires for a discussion on tire conditions.

  89. MLG Brake Wear Indicators (Inboard / Outboard) — Check
  90. MLG Tires/ Brakes — Check
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  92. MLG Wheel Flange Retaining Rings (Inboard / Outboard) — Check
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  94. MLG WOW Switch — Check
  95. The WOW switch should be in contact with the cam:

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    You should also ensure the mooring tie down is full down and the retaining spring intact. Why?

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    See: Gulfstream Journal April 25, 2014, "GII-G550: Amber Main Gear Door Open, L-R, Message after Gear Retraction.

  96. MLG Side Brace Actuator & Sequencing Linkage — Check
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  98. Flap Drive Rods — Check
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  100. MLG Uplock — Open
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  102. MLG Wheel Well Area — Check
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    Cannon Plugs Inside MLG Wheel Well — Check

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  104. Main Fuel Shutoff Valve Position — Verify Open
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  106. Fuel Boost Pumps — Check / No Leaks
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  108. Right main Landing Gear Door Control Valve — pin removed / flight position
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  110. MLG Safety Pin — Remove
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  112. Wing Anti-Icing Vents — Clear
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  114. Engine Cowl / Accessory Door / Vents / Exhaust — Check / Secure / Clear
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  116. APU Exhaust — Clear
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  118. Precooler Exhaust — Clear
  119. Heat Exchanger Exhaust — Clear
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  121. Aft Fuselage Antennas — Check
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  123. Elevator / Rudder / Static Wicks — Check
  124. Tail Cone Navigation Light / Static Wick — Check
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    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 Strobe Light Fault Indicator.

  126. Heat Exchanger Exhaust — Clear
  127. Precooler Exhaust — Clear
  128. Engine Cowl / Accessory Door / Vents / Exhaust — Check / Secure / Clear
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  130. GND PWR RCPT Circuit Breaker — Check
  131. GND SVR BUS Switch — ON
  132. GND SVR Bus Indicator — CHECK
  133. UTILITY LIGHTS Switch — ON
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  135. Right Battery Charger — Check
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  137. Hydraulic Replenisher Fluid Level / Manual Selector Valve / Pump Switch — CHECK FLUID LEVEL / VALVE OFF / SWITCH OFF
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  139. Hydraulic System Reservoir Quantity — CHECK (AT HYD RESERVOIR QTY INDICATOR)
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  141. Oil System Reservoir Quantities — CHECK (AT FLUID QTY INDICATOR)
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  143. Engine Oil Replenisher Fluid Level / Manual Selector Valve — CHECK / VALVE OFF
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  145. Power Transfer Unit (PTU) DPI (1) — Check
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    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.

  147. Right Hydraulic System Filter Differential Pressure Indicators (DPIs) (3) — CHECK
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    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 Hydraulics / DPIs for the reason why.

  149. Main Batteries (Left and Right) — CHECK
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  151. APU Tailpipe — CHECK
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  153. AUX Hydraulic Pump / DPI (1) — CHECK
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    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 Hydraulics / DPIs for the reason why.

  155. AUX Power Relay Box CBs (6) — CHECK
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  157. BLEED AIR Isolation Valve — CHECK
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  159. Ozone Filters (Left and Right) — CHECK
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  161. Air Conditioning Packs (Left and Right) — CHECK
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  163. Left Hydraulic System Filter DPIs (5) — CHECK
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    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 Hydraulics / DPIs for the reason why.

  165. Left Battery Charger — CHECK
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  167. Elevator Actuators (2) — CHECK
  168. Rudder Actuator — CHECK
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    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.

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    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.

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    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.

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    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 Gust Lock.

  170. UTILITY LIGHTS Switch — OFF
  171. GND SVR BUS Switch — OFF
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  173. Tail Compartment Ladder / Door — SECURE / CLOSE
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  175. L / R Hydraulic Accumulators — CHECK (1200 PSI)
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  177. Ground Service Panel Door — SECURE
  178. Aft Lavatory Service Door — SECURE
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  180. External Air Access Door — CHECK / SECURE
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  182. Aft Water Service Door — SECURE
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  184. Baggage Door — SECURE
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    Note: The door should be unlocked for flight — in the pictured, horizontal, position — to allow access by crash rescue if needed.

  186. MLG Wheel Well Area — Check
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  188. Cannon Plugs Inside MLG Wheel Well — Check
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  190. Main Fuel Shutoff Valve Position — CHECK
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  192. Fuel Boost Pumps — Check / No Leaks
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  194. Cockpit / Cabin Trim Air Valve Vent Elbow — Check/Clear
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  196. Flap Drive Rods — Check
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  198. MLG Uplock — OPEN
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  200. MLG Side Brace Actuator & Sequence Linkage — Check
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  202. MLG Fairing Door / Strut — Check
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  204. MLG WOW Switch — Check
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    images
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    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.

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

  210. MLG Brakes Wear Indicators (Inboard / Outboard) — Check
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  212. MLG Door Control Valve — Check
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    Wing Anti-Icing Vents — Clear

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

  214. MLG Safety Pin - Remove
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  216. Aileron, aileron bungee, flaps, spoilers - Check
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  218. Static Wicks (3) - Check
  219. Winglet - Check
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  221. NAV / Strobe Light / Wing Tip - Check
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    How do you know if the strobe is okay? See: G450 Strobe Light Fault Indicator.

  223. Fuel Tank Plenum Drain — Check
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  225. Fuel Tank Vent — Check
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  227. Wing Leading Edge — Check
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  229. Pressure Fueling Static Port — Check
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  231. Fuel Sump Drains — Check / Not Leaking Fuel
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  233. Engine Inlet / Cooling Inlets — Cover Removed / Check
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  235. Window Emergency Releases / Windows — Secure
  236. Emergency Lights / Ice Inspection Lights — Check
  237. Landing Light — Check
  238. Wing Vent — Clear
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  240. Main Entrance Door / Seal — Check
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  242. Door Control Valve Pins / Landing Gear Safety Pins / Pitot Probe Covers — Stowed
  243. There should be three door pins:

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    There should be three gear pins:

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References

Gulfstream Journal April 25, 2014, "GII-G550: Amber Main Gear Door Open, L-R, Message after Gear Retraction.

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, G450-OMS-02, Extended Operations (ETOPS) Guide, Revision 2, April 2, 2009

Revision: 20161012
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