State Police Supt. Rick Fuentes will be the chief witness at Tuesday's Assembly Homeland Security Committee hearing.
Committee Chairwoman Annette Quijano says she wants to find out who approves helicopter travel and how flight arrangements are made.
The governor's office says Christie or his staff used the helicopter 35 times in 16 months.
A political firestorm erupted after Christie took the chopper to see his son play high school baseball.
The governor reimbursed taxpayers for the cost of two flights to his son's games. The Republican State Committee repaid the cost of a third, a meeting with Iowa delegates trying to persuade Christie to run for president.