Wikiposts
Search
Engineers & Technicians In this day and age of increased CRM and safety awareness, a forum for the guys and girls who keep our a/c serviceable.

Cessna 152 ALT/BAT switch

Thread Tools
 
Search this Thread
 
Old 15th Apr 2008, 14:35
  #1 (permalink)  
Thread Starter
 
Join Date: May 2006
Location: Oxfordshire UK
Posts: 54
Likes: 0
Received 0 Likes on 0 Posts
Cessna 152 ALT/BAT switch

Hello All,

Hopefully an easy to answer question please.

In the Cessna 152, the joint ALT/BAT switch. Are these two switches fully mechanically independent of each other (no mechanical link between them) or are they linked mechanically in certain conditions. I.E. turn ON the ALT and that also turns ON the BAT? OR am I getting confused with the similar switches in pipers that are mechanically linked and the Cessna switches are fully independent?

Thanks in advance

Alex Ford.
Alex_Ford is offline  
Old 16th Apr 2008, 19:19
  #2 (permalink)  
 
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 33,166
Received 3,036 Likes on 1,281 Posts
Blimey, now you got me thinking and I operate them every day lol...Same as a Piper I think or I am 99.99999% sure, you turn one on and it turns the other on as you said, but you can turn the alt off and then on on it's own..........

But will just check tomorrow
NutLoose is offline  
Old 17th Apr 2008, 03:08
  #3 (permalink)  
 
Join Date: Apr 2008
Location: Louisiana, USA
Age: 54
Posts: 67
Likes: 0
Received 2 Likes on 2 Posts
Been many moons, but I believe the NutLoose is correct. They go to the on position together, but you can turn off the alternator half of the switch with the battery half of the switch will stay on.
helofixer is offline  
Old 17th Apr 2008, 03:21
  #4 (permalink)  
 
Join Date: Oct 2005
Location: USA
Posts: 3,218
Likes: 0
Received 0 Likes on 0 Posts
Mechanically, they are one switch. Electrically, they are not. Electrically, they are two independent switches.
SNS3Guppy is offline  
Old 17th Apr 2008, 11:42
  #5 (permalink)  
 
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 33,166
Received 3,036 Likes on 1,281 Posts
Piper I checked today they could both be turned off and on independently of each other....

Cessna 152 switch just checked this minute

Alt cannot be turned on without it turning the Battery switch half on, ie push the Alt half in and the Battery half goes in too.

Battery can be turned on, on its own without turning the Alt switch half on.

Once Battery half is on Alt can be turned off and on independently as long as battery half remains on.. Two switches built into one item.

Hope that helps

Now on a 172R you have one Avionics Master switch, but that has 2 independent switch halves internally for both Avionics bus bars.. but only one externally visible operatable switch
NutLoose is offline  
Old 17th Apr 2008, 12:36
  #6 (permalink)  
 
Join Date: Oct 2005
Location: USA
Posts: 3,218
Likes: 0
Received 0 Likes on 0 Posts
Alt cannot be turned on without it turning the Battery switch half on, ie push the Alt half in and the Battery half goes in too.

Battery can be turned on, on its own without turning the Alt switch half on.

Once Battery half is on Alt can be turned off and on independently as long as battery half remains on.. Two switches built into one item.
Mechanically, one switch assembly. Electrically, two independent switches.
SNS3Guppy is offline  
Old 17th Apr 2008, 19:19
  #7 (permalink)  
 
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 33,166
Received 3,036 Likes on 1,281 Posts
Quote:
Alt cannot be turned on without it turning the Battery switch half on, ie push the Alt half in and the Battery half goes in too.

Battery can be turned on, on its own without turning the Alt switch half on.

Once Battery half is on Alt can be turned off and on independently as long as battery half remains on.. Two switches built into one item.
Mechanically, one switch assembly. Electrically, two independent switches.


Semi Independant as you cannot electrically operate one without the other.
NutLoose is offline  

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 Off
Pingbacks are Off
Refbacks are Off



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.