Oxygen Bottle & Main Batteries

I have to change the crew oxygen bottle the other day and i want to share something that is unique about B737 NG which is the crew oxygen bottle and two main batteries are next to each other. On BBJ's that i work on 3 out of 4 don't have external panel for crew oxygen servicing so basically we have to change the bottle every time it drop below dispatch limit.

Located in E&E bay (avionic compartment) however to change either the batteries or the oxygen bottle, access from the forward cargo is required. Forward bulkhead of the forward cargo need to be removed for access. The panel secured with quick release fasteners which make it easier to be removed.

What I'm trying to highlight here is, in my opinion as well as other working mate that I've spoken with, we are surprised to saw this condition as batteries and oxygen which both is considered very sensitive and dangerous item positioned next to each other. I guess Boeing have calculated all the risk to allow this configuration.

Birdstrike on radome.

Aircraft arrived back with sign of birdstrike on nose radome, inspected and tap test test to determine any delamination found nil damaged apart from paint flaking.

Further inspection carried out on landing gears, airconditioning intakes and engines show no secondary damaged. Checked with pilot for any changes in engines parameters found nil problem.

The impact area cleaned-up and aircraft is ready to fly back. Of course now we are waiting for replacement radome as it looks very unpleasant especially for a VIP aircraft.

Hydraulic System Transfer

Hydraulic system on B 737 divided into 3 system which is A, B & Standby however only A & B system quantity shown in the system page on lower display unit. Standby system reservoir is connected to system B.

It can happen that few amount of hydraulic fluid did transfered to one another during flight even though theoretically it's not posible. It can happen through movement of shuttle valve that connect both system together when it supplied as back-up such as alternate brake. To normalise it back basically we need to drain it and replenish another system system with new fluid.

Experienced 737 engineer know the trick to transfer it with-out to drain and topping-up. Here i would like to share you the trick. From the photo we can see system B is higher, now to transfer from B to A.

1. Turn on B emdp pump.
2. Set park brake.
3. Turn on A emdp pump.
4. Turn off system B pressure by operate the flight control
5. Release park brake.
6. Turn off system A emdp pump.

After few repetition we can see the fluid transfered to another.

* This is just for information sharing and not to replace the aircraft maintenance manual procedure.

View of Nile

I was on the way back from Alger, Algeria to Riyadh when our aircraft pass through Egypt, what a view as i can see how Nile River green-up Egypt. On both side of the river there is only desert but what the river contribute to the land is very amazing.