ditching airbus flt 1549

"Bertie the Bunyip" wrote in message
...
"RST Engineering" wrote in
m:

.
.

It has been nearly fifty years since I went to Boeing school, so
please forgive the misrememberances. As I recall, once the engines
spool up and take the load, the APU is shut down and once the aircraft
has departed, the squat switches have to be enabled to restart the
APU. It cannot be started airborne.



At least that is my memory. The reason I say that is that I was
trying to do some autopilot work for which I needed electrics and
hydraulics and with the airplane on jacks, I couldn't get the APU to
fire up. Perhaps one of the sparkies pulled a breaker somewhere so
that I couldn't accidentally activate the gear via the
APU/electrics/hydraulics, but I also remember something in school
about it.

You remember correctly, but only for the transversely mounted APUs in the
707 and 727. All those tail mounted APUs can be run throughout the flight
and sometimes are if, for instance, an engine driven genny is U/S. They
can
be started in flight, even, and for Cat 3 landings they usually ae, though
this is usually not a requiement to do the Cat 3


Bertie

You are totally full of ****.

"Maxwell" #$$9#@%%%.^^^ wrote in
:


"Bertie the Bunyip" wrote in message
...
"RST Engineering" wrote in
m:

.
.

It has been nearly fifty years since I went to Boeing school, so
please forgive the misrememberances. As I recall, once the engines
spool up and take the load, the APU is shut down and once the
aircraft has departed, the squat switches have to be enabled to
restart the APU. It cannot be started airborne.



At least that is my memory. The reason I say that is that I was
trying to do some autopilot work for which I needed electrics and
hydraulics and with the airplane on jacks, I couldn't get the APU to
fire up. Perhaps one of the sparkies pulled a breaker somewhere so
that I couldn't accidentally activate the gear via the
APU/electrics/hydraulics, but I also remember something in school
about it.

You remember correctly, but only for the transversely mounted APUs in
the 707 and 727. All those tail mounted APUs can be run throughout
the flight and sometimes are if, for instance, an engine driven genny
is U/S. They can
be started in flight, even, and for Cat 3 landings they usually ae,
though this is usually not a requiement to do the Cat 3


Bertie

You are totally full of ****.



Yeh, right Maxie.
Very convincing.

Bertie

On Wed, 21 Jan 2009 20:26:08 -0700, "Private"
wrote:

http://online.wsj.com/article/SB123241485664396363.html

Happy landings,

"...Crash investigations determined that a so-called ram air
turbine..."

"So-called"??? It IS called that! Sounds like "alleged ram air
turbine"...

--
"You sure it's broken? Let me make sure..."

Dana M. Hague wrote in
:

On Wed, 21 Jan 2009 20:26:08 -0700, "Private"
wrote:

http://online.wsj.com/article/SB123241485664396363.html

Happy landings,

"...Crash investigations determined that a so-called ram air
turbine..."

"So-called"??? It IS called that! Sounds like "alleged ram air
turbine"...


Now now, it hasn' tbeen tried in a court of law yet


Bertie