Richard Hamermesh Form 3 ROCKWELL COLLINS / Richard Hamermesh ownership change

POWER OF ATTORNEY





I, Richard G. Hamermesh, appoint Patrick E. Allen, Robert J. Perna,

Vaughn M. Klopfenstein and Joshua A. Mullin, signing singly,

attorney-in-fact to:



(1) Execute on my behalf and in my capacity as a director

of Rockwell Collins, Inc., a Delaware corporation (the Company), Forms 3, 4

and 5 (the Form or Forms) in accordance with Section 16(a) of the Securities

Exchange Act of 1934 (the Act) and the rules thereunder; and



(2) Perform any and all acts on my behalf which may be necessary or desirable

to complete and execute any Form and timely file such Form with the United

States Securities and Exchange Commission and any stock exchange or similar

authority; and



(3) Take any other action in connection with the foregoing which, in the

opinion of such attorney-in-fact, may be of benefit to, in the best interest

of, or legally required by me, it being understood that the documents

executed by such attorney-in-fact on my behalf pursuant to this Power of

Attorney shall be in such form and shall contain such terms and conditions

as such attorney-in-fact may approve in his discretion.



I grant to each such attorney-in-fact full power and authority to do and

perform any act necessary or proper to be done in the exercise of any of

the rights and powers herein granted, as fully to all intents and purposes

as I might or could do if personally present. I ratify and confirm all

that such attorney-in-fact shall lawfully do by the rights and powers

granted by this Power of Attorney. Each attorney-in-fact shall have

full power of substitution or revocation.



I acknowledge that the attorneys-in-fact, in serving in such capacity at

my request, are not assuming, nor is the Company assuming, any of my

responsibilities to comply with Section 16 of the Act.



This Power of Attorney shall remain in full force and effect until I am

no longer required to file the Forms with respect to my holdings of and

transactions in securities issued by the Company, unless I earlier revoke it

in a signed writing delivered to the Office of the Secretary of the

Company for distribution to the foregoing attorneys-in-fact. This

Power of Attorney revokes any previous Power of Attorney of the same

issuer on the same subject.



IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to

be executed as of this 13th day of April, 2017.



/s/ Richard G. Hamermesh

Richard G. Hamermesh