Jump to content
Aero Precision provides OEM part support for military aircraft operators across more than 20 aircraft
Sign in to follow this  
saikojer

External electrical power unable to connect to the aircraft by using GPU AC Supply

Recommended Posts

Hi guys, we are looking for solution to verify on the problem with "External electrical power unable to connect to the aircraft by using AC receptacle" for aircraft LAC : 5309 which using Electrical Supply Upgrade (ESU)'s system.

While using DC receptacle it's been function normally. Hopefully all expertise out there can be any idea guide to solve this problem.

Anyone ever had this problem?

Any help would be great.

:o:o

Share this post


Link to post
Share on other sites

Hi guys, we are looking for solution to verify on the problem with "External electrical power unable to connect to the aircraft by using AC receptacle" for aircraft LAC : 5309 which using Electrical Supply Upgrade (ESU)'s system.

While using DC receptacle it's been function normally. Hopefully all expertise out there can be any idea guide to solve this problem.

Anyone ever had this problem?

Any help would be great.

Assuming the power unit has been checked and verified as supplying power with in limits and you are still not getting a green light, try using the E-pin bypass switch on the power unit if equipped. If that does not work or there is no E-pin bypass switch, and the green ready light is not lit on the electrical panel, go to FS 245 and look for a bank of 4 diodes and one glass fuse. Ohm each out individually. If those check out good then you need to troubleshoot the external power phase and voltage sensor(s) found at FS 245. Many times it is the diodes that blow. My other question is, does the AC external power switch go to on or does the rattler prevent turning on of the switch? If the switch is preventing the switch from turning on, then the problem lies in the external power sensing system (diodes, fuse, freq/volt sensor) if the switch turns on but no power, check external power contactor.

Share this post


Link to post
Share on other sites

Even though the switch turns power off if you lose the green light, it still has contacts that could fail. But he never mentions if the green ECT AC PWR light was on or not. The problem (if it's on the airplane side) likely lies in the sensing system like you say, Ramrod...assuming the green light never comes on.

Even though the aircraft has had the ESU modification, this should not affect this problem at all...at least, if it's the same ESU mod we had on the USAF side back in the day.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...