The blueprints are rolled up in the window near the factory roof. If they aren't there, you already have them in your items. There is no reported glitch with the blueprints.
on the factory window
If you already have the blueprints to the factory vent system, go up into the factory. Otherwise, use the transporter to go back outside, and get the plan from the window near the roof.
24 Carrot Island is the 4th island of Poptropica. It came out in June, 2008.
The mayor of the town on 24 Carrot Island will give you the Island Medallion when you complete the quest.
24 Carrot Island does not have a cockpit. 24 Carrot Island was released in 2008 and the main objective of the game is to stop the evil Dr. Hare from controlling Poptropica.
On 24 Carrot Island, the vent diagram is in a window near the roof. On Big Nate Island, the school blueprint is in Nate's locker. The secret map to the Time Capsule is under a rock on Seal-Saw Island.
At the carrot factory.
24 carrot diner isn't in shark tooth it is in 24 carrot
He is at the carrot factory.
He is in the carrot cake factory
in the air vent
Before you go to the Carrot Cake Factory to the right of Main Street, you will need the crowbar, which you can get for returning the lost cat to Charlie's Carrot Surplus. Then at the factory, you need the blueprints found by the window near the roof. Then you can enter the factory. (see related questions)