All landing gear downlock pins must be installed when parked or towed. The nose landing gear steering must be depressurized before towing.
External ELEC Power
115V 400Hz for aircraft systems, 115V 60Hz for cabin systems
Engine Oil Servicing
The reservoir servicing can be done between 5-30 mins after engine shutdown. (Reserv. on the right side of eng cowling)IDG is on the left side of eng cowling
737 Fueled and defueled at the single-point station on the right wing
Nose wheel steering is depressurised with the towing lever. Downlock pins are ery important.
Have 2 Packs, same type. Even one would be enough for cabin by itself.
Warm air from bleed air -> Heat Exchangers -> Air Cycle Machine
Air Condt - Pack Operations
The ram air doors are fully open while on ground and during slow flight with flaps extended. (For heat exchange)
It has own light illumination on air condt panel
Pack Temp Control Valve
To control the bleed air that goes into pack, you use the pack switches on air condt panel
The air from left pack first goes to the Flight Deck and rest goes to mix manifold.
The air from right pack goes to mix manifold.
From the mix manifold air goes to FWD and AFT Pax cabin
Temperature Control - Air Condt
Temperature control of 3 zones : Flight deck, FWD and AFT
Trim air sys uses warm bleed air from upstream of the pack to warm up pack air for related zones
EQP Cooling System
Supply fan collects the cool air from Pax cabin and supllies it to cocpit displays and E&E bayExhaust fan collects the warm air from cocpit displays, CBs and E&E bay. On the GND its open and discards warm air. During flight it sends the warm air to cargo bay
Air Condt Non-Normal Operations
If downstream air temp from packs is too high we see the illumination : ZONE TEMP on the related Temp Controller/ We choose a colder selection and chechk the temperature change
-Has an outflow valve on aft fuselage-2 digital cabin press. controllers in E&E bay-Adjust the cruise and landing ALT on overhead Press Panel before T/O
Pressurization System Non-Normal Ops
-Off-Schedule Descent-Diversion to Alternate Airport-Single controller failure-Dual cont fail-Cabin ALT higher then limits