Search
Notices
Flight Schools and Training Ratings, building hours, airmanship, CFI topics

Weight and Balance

Thread Tools
 
Search this Thread
 
Old 11-07-2008, 12:11 PM
  #11  
Gets Weekends Off
 
multipilot's Avatar
 
Joined APC: Oct 2006
Posts: 778
Default

Originally Posted by Ewfflyer View Post
AFM's are what you buy in the store, POH is what's in the plane and required to be there. Be careful when using the wording on a Check-ride, someone that is anal would take it out of context. AFM's will use a generalized number coming from the assumed average of the fleet.
On the contrary. AFM, Airplane Flight Manual, is defined as a document developed by the airplane manufacturer and approved by the FAA. It is specific to a particular make and model airplane by serial number and it contains operating procedures and limitations.

A POH is a document developed by the airplane manufacturer and contains the FAA approved AFM information. Also referred to as information manuals. There is also usually a big notice box on the first page of the book notifying the reader that the information is a duplicate of the AFM and is to be used for general purposes only.

Reference FAA-H-8083-3A. While I'm not a DE, students have to go through my end-of-course before they get to the DE and I am pretty darn thorough.
multipilot is offline  
Old 11-08-2008, 10:57 AM
  #12  
Gets Weekends Off
 
Pilotpip's Avatar
 
Joined APC: Jun 2005
Position: Retired
Posts: 2,934
Default

The AFM was required sometime in 1978. The flight school I worked at had two identical 172s. One was built before the date and had a generic 1/2 POH in it, the other after and contained the AFM we are all familiar with.
Pilotpip is offline  
Old 11-08-2008, 06:12 PM
  #13  
Moderator
 
Cubdriver's Avatar
 
Joined APC: May 2006
Position: ATP, CFI etc.
Posts: 6,056
Default

Originally Posted by Zayghami View Post
Okay I already forgot. Since I got my ppl I dont do weight and balances that much anymore but anyways my question is this. How do I figure out the moment and the arm of the Basic Empty Weight of the Airplane. I fly a Archer II. I know the empty weight of my airplane is 1416 pounds. Any help.
You need an airframe-specific Arm number. It is in the airplane, is in the AFM, or is kept with the airplane's maintenance records.

Whenever equipment is added or removed from an airplane, the FARs state that an updated W&B must be provided with the airplane and furnished with it so the pilot can use it to do W&B calculations.

The reason for this is fairly obvious. If an averaged arm and weight figure is used instead of an airframe-specific number there may be enough inaccuracy to cause problems leading to dangerous situations in CG placement.

I had a student produce a generic POH from the internet or some other source which was not specific to the serial number airplane he was going to fly. First of all, I noticed he was doing preflight items that had nothing to do with our airplane. I asked him why he did not use the airframe-specific AFM sitting in leather pocket in the airplane, and he blew up saying it's all the same. He was completely missing the reality of the situation which is that each airframe has particular operational procedures and numbers that are prescribed with it according to the equipment installed. Airplanes are not all the same, they are serial number-specific machines that have serial number-specific physical attributes the pilot must have access to.

Last edited by Cubdriver; 11-08-2008 at 06:20 PM.
Cubdriver is offline  
Old 11-09-2008, 05:57 AM
  #14  
Flying Farmer
 
Ewfflyer's Avatar
 
Joined APC: Jul 2006
Position: Turbo-props' and John Deere's
Posts: 3,160
Default

*sighs*

Let's summarize

You need the Factory Issued manual(POH, AFM, whaterever you want to call it) with the Specific Serial Number listed in the cover page, Equipment list, and Current W&B. Obviously they are superceeded with various installations over the years unless you happen to get into a brand new airplane.

Without these documents, you are using a "standard" form that might or most likely not match the individual aircraft you are flying.
Ewfflyer is offline  
Old 11-09-2008, 06:56 AM
  #15  
On Reserve
 
Joined APC: Apr 2008
Posts: 14
Default

WOW, this is sad
milonke is offline  
Old 11-09-2008, 10:25 AM
  #16  
Line Holder
 
DC2495's Avatar
 
Joined APC: Sep 2008
Position: 135, REALLY SMALL!
Posts: 42
Default

Remember AROW? The POH/AFM has to be aircraft specific, with the registration number and serial number stamped on it. The updated W & B can be inserted into the AFM/POH, or can be stored seperatey, the key is though, it has to be in the aircraft. On the W & B sheet will be such things as Empty Weight, Moment & CG. Other useful information that will also be on the W & B sheet is the useful load of that specific aircraft. The best thing to do if yo are flying a training fleet is go talk to the maint guys. They will usually have all the info on an excel spread sheet and you can keep it on your computer for reference when you are doing different flights in different airplanes. If you have your own aircraft and you don't have a W & B sheet in your aircraft, you need to get one. Again, make a copy so you you can have the info before you get to the airport.
DC2495 is offline  
Old 11-11-2008, 08:46 PM
  #17  
Gets Weekends Off
 
the King's Avatar
 
Joined APC: May 2007
Position: JS32 FO
Posts: 848
Default

As an extra pointer, it's not a good idea to get in the habit of neglecting W&B. You won't be able to do that when you move to your first job, and as you notice, you'll be unaware of what to do if you took an abnormal load for the kind of flying you do. For instance, you take four in the Archer. How much fuel you can carry is going to be a problem unless you run the numbers.
the King is offline  
Old 11-11-2008, 09:03 PM
  #18  
Gets Weekends Off
 
Pilotpip's Avatar
 
Joined APC: Jun 2005
Position: Retired
Posts: 2,934
Default

His royal highness beat me to it. You want to be a pro some day? Act like one now. We might get our numbers fed to us, but we still have to make sure they are legit.

Take 10 minutes to get a weather briefing, and do performance calculations. Yes, it's a PITA. But guess what? You won't be asking elementary questions like you did here. I'm sorry, but what you're doing is just lazy.

Furthermore, there's this little thing in the Regs about preflight planning. What's your defense when you get ramp checked and have NOTHING to support that you did that preflight planning?

This might have been my greatest pet-peeve with my post-solo students. It downright infuriated me when a commercial student was unprepared.
Pilotpip is offline  
Old 11-12-2008, 07:25 AM
  #19  
Line Holder
 
DC2495's Avatar
 
Joined APC: Sep 2008
Position: 135, REALLY SMALL!
Posts: 42
Default

Originally Posted by Pilotpip View Post
His royal highness beat me to it. You want to be a pro some day? Act like one now. We might get our numbers fed to us, but we still have to make sure they are legit.

Take 10 minutes to get a weather briefing, and do performance calculations. Yes, it's a PITA. But guess what? You won't be asking elementary questions like you did here. I'm sorry, but what you're doing is just lazy.

Furthermore, there's this little thing in the Regs about preflight planning. What's your defense when you get ramp checked and have NOTHING to support that you did that preflight planning?

This might have been my greatest pet-peeve with my post-solo students. It downright infuriated me when a commercial student was unprepared.
For some reasons it's the commercial guys that do it most too! I'll ask if they have received a weather briefing? 9 times out of 10 the answer is "NO, were just flying around here!" Drives me crazy!
DC2495 is offline  
Old 11-12-2008, 08:12 AM
  #20  
Prime Minister/Moderator
 
rickair7777's Avatar
 
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,273
Default

Originally Posted by Pilotpip View Post
The AFM was required sometime in 1978. The flight school I worked at had two identical 172s. One was built before the date and had a generic 1/2 POH in it, the other after and contained the AFM we are all familiar with.
Correct. AFM and POH are two names for the same thing. Both are the required legal document, which must be maintained with current updates from the manufacturer (they mail them to you). This manual is one-of-a-kind for each individual serial number. If you lose it you CANNOT fly the airplane until you get a new one from the factory. They will include all updates, and it takes two weeks and about $350.

The thing you buy in the pilot store is a POH/AFM reprint, current only to the date of publication and may not have info unique to your serial number. It is a reference book, and does NOT replace the real AFM/POH for legality purposes. If you get ramp checked with a pilot-shop AFM, you are going to get violated.
rickair7777 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Your Privacy Choices