Item No.:                    4c_supp 
Meeting Date:          December 9, 2014 
B Concourse 400Hz Gate
Improvements Project 
CIP C800019

Final Phase of 400Hz Gate
Improvements Project

400Hz Power From Onboard APU

400Hz Power From Diesel
Ground Power Unit

400Hz Aircraft Power via Motor
Generator

Single Stinger to Aircraft

400Hz Motor Generator

Project Synopsis 
This project will install a 400Hz ground power
system consisting of two motor generators, gate
boxes, stingers and other equipment to all 13 gates
on the B Concourse. 
No incremental costs to the airlines - airlines pay the
same lease rate regardless of the amenities provided
at the gates. 
The B Concourse gates at SEATAC do not provide an
equivalent level of service to the airlines as all the
other airport gates.

What has changed 
Project was 100% designed in 2011, since that time gates B1
and B4 have been added to the B Concourse 
The PC air project has been completed on the B Concourse. 
The airlines and aircraft electrical load requirements have
changed 
The National Electrical Codes have changed. 
The B Concourse 400Hz system design was deferred given that
we did not know what airlines and aircraft types would be using
B Concourse.

Project Schedule 
Acquisition planning      Nov 2014 
Commission approval      Dec 2014 
Design start             Jan 2015 
Design complete         June 2015

What this project will deliver to
the B Concourse 
Gate Box 
To 400Hz
Stinger                                     Motor
Generator