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The only action that may require aircrew to be in the E & E bay
is an APU overspeed reset, the procedure for which is contained in the Aircrew
Servicing Manual (if your company has one). The bottom two photographs show the location of the APU
control unit, although it will be labeled in the bay.
The battery is also located in the E&E bay. It sits on the
external DC power receptacle which is used to start the APU if the battery
voltage is insufficient. Note this is not fitted to the NG’s because if the
battery voltage is that low it must be replaced.
Click on the photos to enlarge and find out what lurks behind
this hatch.
For a location chart of all of the E & E bay
components see the book.
Fluid Ingress
On 22
October 1995, G-BGJI, a 737-200Adv experienced undemanded yaw & roll oscillations
during an air test. This was put down to fluid from the cabin leaking into the E
& E bay and onto the yaw damper coupler. The
report stated:
"The location of the
Electronic and Equipment (E&E) Bay, beneath the cabin floor in the area of
the aircraft doors, galleys and toilets made it vulnerable to fluid ingress
from a variety of sources."
Only the E1 rack is vulnerable to fluid ingress because it
is directly below the forward entry door, the other racks are much further aft.
For protection the classics have a carpet over the E1 rack and the NG's have
drip trays over all racks. The time to be careful is when the forward doors are
open on a turnaround with heavy rain coming in.
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The E & E Bay
