G-1 Cabin Configuration
The main cabin of the G-1 has a floor area of ~165 ft2, a floor width of ~66", and a mid-cabin height of 71". Figure 1 shows key dimensions of the cabin in plan view; Figure 2 shows dimensions at a mid-cabin cross-section. Aircraft center of gravity is approximately 115" aft of the main dimension reference line. Instrument racks are mounted on clips that are inserted into the floor tracks (3/4" increments along tracks) in the floor (dashed lines in Figure 1). The maximum height of an instrument rack that is to be positioned tight against the cabin wall is ~51"; taller racks can be accommodated if they can be located away from the wall. Pairs of floor tracks (12" spacing) run the full length of either side of the cabin. A third track located near mid-cabin allows for mounting instrument racks perpendicular to the cabin axis. A storage cabinet and the power distribution rack are permanently located in the forward, right corner of the cabin and the data acquisition system rack is located in the aft right area of the cabin with space for a seat behind it. Up to three other seats can be positioned within the cabin on the floor tracks.
Instruments are mounted in single or double bay standard 19" electronic racks that are fastened to the floor tracks. PNNL can provide racks that are 42" tall (39" of bay height) and 17" and 24" deep for single and double bay racks, respectively. PNNL's racks are constructed of standard aircraft-rated rack components obtained from AMCO. User-provided racks must be structurally capable of withstanding a 9-G forward load when populated with instruments and meet applicable PNNL safety standards. Racks deeper than 24" can be accommodated in the cabin, but, as shown in Figure 3, rack depth is restricted to Depthmax = 45 - 0.5 * Width (inches) to negotiate the 90? turn from the forward door into the aisle. The standard PNNL double bay rack, 42.5" wide by 24" deep, is about as large a rack as can be easily maneuvered into the cabin. Larger systems can be disassembled, brought on board piecemeal, and reassembled in the cabin.
Racks are positioned within the cabin so that inlet lengths to instruments are minimized and so that there is at least 18" of space between racks and one cabin wall for emergency egress from the cabin. Inlets are mounted on 1/4" aluminum plates that replace the forward 1st and 2nd windows on the right and the 1st and 4th windows on the left. Windows are nearly elliptical, 27-1/4" wide by 20-3/8" high. Hot -air exhausts, vacuum venturiis, and instrument vents are mounted on the 2nd window on the right.
Click on a name in the list below to see the cabin layout for that field campaign:
- Central California Ozone Study (2000) (gif 26kb)
- Texas Air Quality Study (2000) (gif 31kb)
- Phoenix Air Quality Study (2001) (gif 27kb)
- Pacific Northwest (2001) (gif 29kb)
- North East Aerosol Study (2002) (gif 34kb)
- Chemical Processing of Terpene Emissions from Forests (2003) (gif 26kb)
- Northeast Aerosol Experiment (2004) (gif 32kb)
Prior to installation on the G-1, all equipment including racks is weighed. Once on board, the position of all equipment is determined for the calculation of the center-of-gravity of the aircraft.