HARRY W. NICE, GOVERNOR. 681

field, air school, flying club, air beacon, or other air navi-
gation facility, or in any case where the commission shall
issue any order requiring certain things to be done, it shall
set forth its reasons therefor and shall state the require-
ments to be met before such approval will be given or such
order modified or changed. In any case where the commis-
sion may deem it necessary it may apply to a court of
equity to order the closing of any airport, or landing field,
or to order any air school, flying club, or air beacon, or
other air navigation facility to cease operations until it
shall have complied with the requirements laid do^n by
the commission. To carry out the provisions of this Act
the State Aviation Commission and any officers, state or
municipal, charged with the duty of enforcing this Act,
may inspect and examine at reasonable hours any prem-
ises, and the buildings and other structures thereon, where
such airports, landing fields, air school, flying clubs, air
beacons, or other air navigation facilities are operated.
Any order made by this Commission pursuant to this act
shall be served upon the interested person by registered
mail or in person before such order shall become effective.

15C. The Commission or any Commissioner, or officer
of the Commission designated by the Commission, shall
have the power to hold investigations, inquiries and hear-
ings concerning matters covered by the provisions of this
Act, and all accidents in aeronautics within this state. All
hearings conducted by the Commission shall be open to
the public. Each Commissioner, and every officer of the
Commission designated by it to hold any inquiry, investi-
gation or hearing, shall have the power to administer oaths
and affirmations, certify to all official acts, issue subpoenas,
compel the attendance and testimony of witnesses, and the
production of papers, books and documents.

If a person fail to comply with any subpoena or order
issued under the authority of this Act, or if a person in
attendance before the Commission or a Commissioner re-
fuse, without reasonable cause, to be examined or to an-
swer a legal and pertinent question, or to product a book
or paper when ordered to do so by the Commission, the
Commission or such Commissioner may apply to any Judge
of the Supreme Bench of Baltimore City, or of the Circuit
Court of any County, upon proof by affidavit of the fact,
for a rule or order returnable in not less than two or more
than five days, directing such person to show cause before
the Judge who made the order, or any other Judge afore-
said, why he should not be committed to jail; upon the
return of such order, the Judge before whom the matter