Cessna 421B POH

CaptPup · Post by **CaptPup** » Thu Apr 05, 2007 8:05 am

Hello,

Would anyone by any chance have a Cessna 421B POH in word (.doc) or .pdf format? It's a long shot but worth a try.

Thanks!

Hedley · Post by **Hedley** » Thu Apr 05, 2007 8:58 am

http://www.esscoaircraft.com/Cessna_Own ... s/4866.htm

trey kule · Post by **trey kule** » Thu Apr 05, 2007 9:53 am

Hedley.

Are there different POH's for the 421 based on model and serial number?
Unless I have forgotten CARs, you have to have a very specific POH in a specific airplane. Is that not correct?

Which brings me to the question I always have when I see threads like this one. Why does the poster want the POH?

Now, I admit I am jaded here, but I have seen pilots who got a job/or job interview based on the fact they had time on type, and then went and got a POH so they could fake it. But maybe there are other reasons. Which is why I always have to ask the person who starts threads like this. why do you want a POH?

CaptPup · Post by **CaptPup** » Thu Apr 05, 2007 10:06 am

trey kule you are absolutely correct. However, I am only looking for general info for my own use, nothing specific, at least not until I actually start flying the aircraft.

Thanks!

Lost in Saigon · Post by **Lost in Saigon** » Thu Apr 05, 2007 12:33 pm

Trivia Question.....

How many fuel pumps are there on a Cessna 421B with locker tanks?(inculde both electrical and mechanical)

The answer may surprise most of you......

chipmunk · Post by **chipmunk** » Thu Apr 05, 2007 1:12 pm

CaptPuppy, give me a call, I've got some Flight Safety stuff you can borrow.

tiny · Post by **tiny** » Thu Apr 05, 2007 1:24 pm

10 electric and two engine driven pumps total. One in each nac, one in each locker tank, one in each wing and two in each tip plus one driven by each engine. strangly enough all fuel is pumped to the tip and the engine feeds from the tip. The second tip tank pump moves fuel from the back to the front of the tank so that you don't get fuel starvation in a climb.
that many pumps becomes a serious pain when you are trying to trouble shoot fuel snags

Lost in Saigon · Post by **Lost in Saigon** » Thu Apr 05, 2007 2:01 pm

You win the prize!!!

ei ei owe · Post by **ei ei owe** » Fri Apr 06, 2007 10:19 am

More trivia:
How many pumps out of 12 can fail before you have a serious problem? Christ, who invented that system?

tiny · Post by **tiny** » Fri Apr 06, 2007 10:29 am

well, if any pump fails you cann't use the fuel in that tank, the engine will still run as long as the tip tank pumps and the engine driven pump are running, that is untill the tip runs dry

CaptPup · Post by **CaptPup** » Fri Apr 06, 2007 11:23 am

Thanks for the replies. The flight safety manual is great, thanks chip!

These trivia questions are awesome, keep them coming!

Lost in Saigon · Post by **Lost in Saigon** » Fri Apr 06, 2007 12:23 pm

I have about 5,000 hours in twin Cessna's and never had a fuel pump problem.

Maybe I was just lucky.

But to answer your question, you only need 2 of the 12 to work. All the electrical pumps can quit as long as the engine driven mechanical pumps are operating normally.

If the the engine driven pump quits then the main tank "Auxilary Pump" automatically switches to high to supply fuel to the engine.

The tip tank transfer pumps can quit because they only move the fuel around in the tip tank.

The auxilary tank pumps are also not really needed as the C310, C401, C402, C411 didn't even have them. They were only installed in the aux tanks of pressurized C414's and C421's. I assume they prevented vapor lock at high altitudes.

It was possible to dump fuel overboard if you didn't burn down the mains first.

The aux tank return fuel (excess fuel not used by the engine) went back to the main tank even if it was still full. The winglocker tanks just fed directly into the mains via a transfer pump.

Cessna eventually went with a "wet wing" design. This simplified things greatly as there were only 2 tanks instead of 6.

tiny · Post by **tiny** » Fri Apr 06, 2007 12:43 pm

One confusion people have is that the "main tank" is actually the one in the tip, and the "aux tank" is the one in the body of the wing