TIME SHARING AGREEMENT

Exhibit 10.1

TIME SHARING AGREEMENT

THIS TIME SHARING AGREEMENT (the “Agreement”), is made and entered into as of this 23rd day of October, 2007, by and between PRECISION CASTPARTS CORP. (“Operator”) and MARK DONEGAN (“User”);

WITNESSETH, that

WHEREAS, Operator leases that certain Bombardier Inc. CL-600-2B16 aircraft, manufacturer’s serial number 5615, bearing the United States Registration Number N904JK (the Aircraft);

WHEREAS, Operator employs a fully qualified flight crew to operate the Aircraft; and

WHEREAS, Operator desires to sublease said Aircraft with flight crew to User and User desires to lease said Aircraft and flight crew from Operator on a time sharing basis pursuant to Section 91.501(c)(1) of the Federal Aviation Regulations (“FARs”).

NOW THEREFORE, Operator and User declaring their intention to enter into and be bound by this Agreement, and for the good and valuable consideration set forth below, hereby covenant and agree as follows:

1. Operator agrees to lease the Aircraft to User pursuant to the provisions of FAR 91.501(c)(1) and to provide a fully qualified flight crew for all operations on a non-continuous basis commencing on the first date set forth hereinabove and continuing unless and until terminated. Either party may terminate this Agreement by giving thirty (30) days written notice to the other party.

2. User shall pay Operator for each flight conducted under this Agreement the amount determined by Operator to constitute Operator’s actual incremental costs of each specific flight, as authorized by FAR Part 91.501(d), including the actual expense of any “deadhead” flights made for User, not to exceed the maximum authorized by FAR Part 91.501(d). The expenses authorized by FAR Part 91.501(d) and which may each make up a portion of Operator’s incremental costs for a specific flight include and are limited to:

1

3. Operator will pay all expenses related to the operation of the Aircraft when incurred, and will provide an invoice and bill User for the expenses enumerated in paragraph 2 above on the last day of the month in which any flight or flights for the account of User occur. User shall pay Operator for said expenses within thirty (30) days of receipt of the invoice and bill therefor. User shall include with each payment any federal transportation excise tax due with respect to such payment, and Operator shall be responsible for collecting, reporting and remitting such tax to the U.S. Internal Revenue Service.

4. User will provide Operator with requests for flight time and proposed flight schedules as far in advance of any given flight as possible. Requests for flight time and proposed flight schedules shall be made in compliance with Operator’s scheduling procedures. In addition to proposed schedules and flight times, User shall provide at least the following information for each proposed flight at some time prior to scheduled departure as required by the Operator or Operator’s flight crew.

5. Operator shall pay all expenses related to the lease and operation of the Aircraft and shall employ, pay for and provide to User a qualified flight crew for each flight undertaken under this Agreement.

6. Operator shall be solely responsible for securing maintenance, preventive maintenance and required or otherwise necessary inspections on the Aircraft, and shall take such requirements into account in scheduling the Aircraft. No period of maintenance, preventive maintenance or inspection shall be delayed or postponed for the purpose of scheduling the Aircraft, unless said maintenance or inspection can be safely conducted at a later time in compliance with all applicable laws and regulations, and within the sound discretion of the pilot in command. The pilot in command shall have final and complete authority to cancel any flight for any reason or condition which in his judgment would compromise the safety of the flight.

7. In accordance with applicable FARs, the flight crew will exercise all of its duties and responsibilities in regard to the safety of each flight conducted hereunder. User specifically agrees that the pilot in command, in his/her sole discretion, may terminate any flight, refuse to commence any flight, or take other action which in the considered judgment of the pilot in command is necessitated by considerations of safety. The parties agree that Operator shall not be liable for delay or failure to furnish the Aircraft and crew member pursuant to this Agreement when such failure is caused by government regulation or authority, mechanical difficulty, war, civil commotion, strikes or labor disputes, weather conditions, or acts of God.

2

8. Operator will provide such additional insurance coverage as User shall request or require, provided, however, that the cost of such additional insurance shall be borne by User as set forth in paragraph 2(d) hereof.

9. Each party hereto agrees to indemnify and hold harmless the other against all losses, including costs, attorneys fees and expenses by reason of claims for injury to or death of persons and loss of or damage to property arising out of or in any manner connected with the performance of such party’s responsibilities under this Agreement or any breach by such party of any covenant or warranty made herein. Operator and User agree that in the event either party shall be liable to the other for any reason relating to this Agreement, that under no circumstances shall the damaged party be entitled to any special or consequential damages, including but not limited to damages for lost profits.

10. User warrants that:

11. Neither this Agreement nor either party’s interest herein shall be assignable to any other party. This Agreement shall inure to the benefit of and be binding upon the parties hereto, their heirs, representatives and successors.

12. Nothing herein shall be construed to create a partnership, joint venture, franchise, employer-employee relationship or to create any relationship of principal and agent.

13. This Agreement shall be governed by and construed in accordance with the laws of the State of Oregon.

14. TRUTH IN LEASING STATEMENT UNDER SECTION 91.23 (FORMERLY 91.54) OF THE FARS.

(A) THE AIRCRAFT HAS BEEN MAINTAINED AND INSPECTED UNDER FAR PART 91 AND PART 135 WITHIN THE 12 MONTH PERIOD PRECEDING THE EXECUTION OF THIS AGREEMENT. OPERATOR CERTIFIES THAT THE AIRCRAFT IS COMPLIANT WITH APPLICABLE MAINTENANCE AND INSPECTION REQUIREMENTS OF FAR PART 91 AND PART 135 FOR THE OPERATIONS TO BE CONDUCTED UNDER THIS AGREEMENT.

3

(B) THE AIRCRAFT WILL BE MAINTAINED AND INSPECTED UNDER FAR PART 91 FOR OPERATIONS TO BE CONDUCTED UNDER THIS AGREEMENT.

(C) DURING THE DURATION OF THIS AGREEMENT, OPERATOR (Precision Castparts Corp., 4650 SW Macadam Avenue, Suite 400, Portland, Oregon 97239) IS CONSIDERED RESPONSIBLE FOR OPERATIONAL CONTROL OF THE AIRCRAFT IDENTIFIED AND TO BE OPERATED UNDER THIS AGREEMENT.

(D) AN EXPLANATION OF FACTORS BEARING ON OPERATIONAL CONTROL AND THE PERTINENT FEDERAL AVIATION REGULATIONS CAN BE OBTAINED FROM THE NEAREST FLIGHT STANDARDS DISTRICT OFFICE.

(E) OPERATOR FURTHER CERTIFIES THAT IT WILL SEND A TRUE COPY OF THIS EXECUTED AGREEMENT TO: FEDERAL AVIATION ADMINISTRATION, AIRCRAFT REGISTRATION BRANCH, ATTN: TECHNICAL SECTION, P. O. BOX 25724, OKLAHOMA CITY, OKLAHOMA, 73125, WITHIN 24 HOURS OF ITS EXECUTION, AS PROVIDED BY FAR 91.23(c)(1).

(F) THE UNDERSIGNED OPERATOR (Precision Castparts Corp., 4650 SW Macadam Avenue, Suite 400, Portland, Oregon 97239), CERTIFIES THAT OPERATOR IS RESPONSIBLE FOR OPERATIONAL CONTROL OF THE AIRCRAFT AND THAT OPERATOR UNDERSTANDS ITS RESPONSIBILITIES FOR COMPLIANCE WITH APPLICABLE FEDERAL AVIATION REGULATIONS.

The “Instructions For Compliance with Truth-In-Leasing Requirements” attached as Schedule 1 hereto are incorporated herein by reference.

[Remainder of Page Intentionally Left Blank]

4

IN WITNESS WHEREOF, the parties hereto have caused the signatures of their authorized representatives to be affixed below on the day and year first above written. The persons signing below warrant their authority to sign.

A copy of this Agreement should be carried in the Aircraft while being operated hereunder.

5

SCHEDULE 1

INSTRUCTIONS FOR COMPLIANCE WITH

“TRUTH IN LEASING” REQUIREMENTS

Federal Aviation Administration

Aircraft Registration Branch

ATTN: Technical Section

P.O. Box 25724

Oklahoma City, Oklahoma 73125

6