Any repairs made at this point will include the redesigned parts.
Past repairs have included incompatible stone and mortar patches.
The repairs are expected to cost about $78,000 per plane and includes replacing the rivets with stronger ones.
The repairs included the current barrel-vaulted ceiling of the Main Hall.
Out-of-warranty repairs with parts and service included can cost more than $100.
The borough-financed repairs include restoration of three wall murals in the gym.
These repairs lasted five months and included the installation of new electric motors.
The £500 repairs include the renewal of roof gutters and repointing works.
Admiral Barr said the repairs would include an addition to Building 371 to house new equipment and control mechanisms.
Safety and structural repairs include replacing 48 girder pins, was finished by December 22, 2012.