ATRflyer
22nd Dec 2005, 16:36
Hi all,
Just doing a bit of preparation before commencing training on the B737NG by reading through the boeing manuals and also the 737NG Cockpit Companion. I have being looking over flight controls and hydraulics recently and just wondering if anyone out there can help me out with these couple of questions?
1) If in the unlikely event of having a failure of both system B hyd pumps (system B reservoir quantity still full), would the PTU still be capable of extending/retracting the LE devices and Autoslat operation?
I ask this because I get the impression from reading about the PTU in the manual that it is there mainly as a backup incase the output pressure from the System B engine driven pump is low, and isn't really designed to work with the loss of both system B pumps?
2) In relation to the Alternate Flaps System, it is mentioned that the leading edge devices will remain extended if you put the alternate flaps toggle switch in the 'UP' position. Does this only apply if you had first selected the LE/TE devices down with this switch or would it actually be possible to first select both LE + TE devices up, if they were already extended before you lost system B?
Thanks in advance,
All the best,
Atrflyer
Just doing a bit of preparation before commencing training on the B737NG by reading through the boeing manuals and also the 737NG Cockpit Companion. I have being looking over flight controls and hydraulics recently and just wondering if anyone out there can help me out with these couple of questions?
1) If in the unlikely event of having a failure of both system B hyd pumps (system B reservoir quantity still full), would the PTU still be capable of extending/retracting the LE devices and Autoslat operation?
I ask this because I get the impression from reading about the PTU in the manual that it is there mainly as a backup incase the output pressure from the System B engine driven pump is low, and isn't really designed to work with the loss of both system B pumps?
2) In relation to the Alternate Flaps System, it is mentioned that the leading edge devices will remain extended if you put the alternate flaps toggle switch in the 'UP' position. Does this only apply if you had first selected the LE/TE devices down with this switch or would it actually be possible to first select both LE + TE devices up, if they were already extended before you lost system B?
Thanks in advance,
All the best,
Atrflyer