The Lycoming XR-7755
Contracts/Administrative Chronology, 1948
by Kimble D. McCutcheon
27 May 1948. Change Order No. 11 to Contract No. W 33-038 ac-564 as amended.
1. Contract No. W 33-038 ac-564 as amended, is hereby further amended as follows:
- (a) Item 8, Paragraph (a), Article 1 is hereby amended to read as follows:
- "Item 8 – Special test, including necessary test fixtures and parts, shall be run if required for satisfactory accomplishment of test if Item 14 or Item 15 of Supplemental Agreement No. 7 as amended herein. A report in triplicate on each test shall be furnished. Tests on the following may be accomplished if required:
- (a) Bench test of fuel injection equipment.
- (b) Torquemeter and torquemeter pump tests.
- (c) Fatigue test of crankshaft test piece having clutch at center of crankpin.
- (d) Stress coat test of crankshaft.
- (e). Oil scavenge pump tests.
- (f). Supercharger efficiency and distribution tests.
- (g). Fatigue test of link pins."
- (b) Exhibit "1" to Item No. 12, Paragraph (a), Article 1 is hereby amended as follows:
- "Items 12-2 and 12-4 as modified by Paragraphs (a) and (b), Section "First" of Supplemental Agreement No. 7 are hereby amended to provide a maximum of Three Thousand Five Hundred Sixteen (3,516) hours total for both items. No testing shall be accomplished on four-cylinder engines. Testing of the single-cylinder and three-cylinder engines shall be limited in nature to that required for satisfactory accomplishment of the test of Item 14 or Item 15, Supplemental Agreement No. 7, as amended herein."
- (c) Item 14, Paragraph (a), Article 1 is hereby amended to read as follows:
- "Item 14 – Necessary redesign parts and four hundred (400) hours of testing to include a satisfactory fifty (50) hour flight approval test on an XR-7755-1 engine or XR-7755-5 engine built under Item 12-11 or Exhibit "2" to Item 12. Such flight approval test shall be conducted in accordance with Army Air Forces Specification No. XR-28398-A, Amendment 1, Dated 27 January 1944 with the following exceptions:
- (a) A-1. Fuel shall conform to specification AN-F-33.
- (b) F-1. General – This paragraph shall be amended to read: "Aircraft engines and test apparatus shall be subject to inspection by authorized Government representatives who shall be given all necessary facilities to determine conformance with this specification. Unless otherwise specifically authorized, all tests under this specification shall be conducted at the Contractor's laboratory.
- (c) F-3c. Power Calibrations – All power calibrations shall be conducted at simulated sea level conditions.
- (d) F-3d. Following the power calibration, the engine shall be given the following 50-hour endurance test, all of which shall be a simulated seal level operating conditions on a rigid test stand.
- (e) F-3d(1). The first 15 hours shall be composed of alternate periods of 30 minutes at military rated power and speed ratings specified in Lycoming Specification No. 2020-C dated 4 June 1945, and 30 minutes at 40 to 50 percent of military rated power and at a speed to be determined from the propeller load curve.
- (f) F-4h. Accessory Drives – Unless otherwise authorized by the Procuring Agency, actual accessories or suitable loading devices, the type of each to be acceptable to the Government, shall be installed on all accessory drives and operated at normal loads during the 35 hours of endurance running specified in Paragraphs F-3d(2) and F-3d(3). Power calibrations of engine shall be made without loading accessory drives. Accessories required under this paragraph shall be furnished by the Government.
- (g) F-4i. Inspection and Adjustments – Valve clearance adjustments, ignition breaker inspection and adjustment, spark plug cleaning and general resetting of gaps, oil cleaner inspection and cleaning and general external visual inspection of the engine, shall be made at the conclusion of the first 15 hours of operation and at such other times as considered advisable by the Contractor. Replacement of spark plugs prior to the completion of the approval test shall be at the option of the contractor. Disassembly of the engine to any extent prior to the final tear-down inspection, except for the purposes stated above, shall be at the option of the Contractor.
- (h) F-4n(1) Amend the first sentence to read, "During the first 15 hours of operation at least the following data shall be recorded for each 30 minute period".
- (d) The following changes are hereby made affecting certain items listed in Paragraph (a), Article 1:
- (1) By adding to Item 1:
- "As of the effective date of Change Order No. 11 to this contract no further work shall be accomplished on this item, and parts and engines heretofore assigned to the accomplishment of this item shall be used as required in the accomplishment of other items remaining on this contact."
- (2) By adding to Item 7:
- "As of the effective date of Change Order No. 11 to this contract no additional procurement of rough forgings, castings, and bearings shall be made, and rough forgings, casting and bearings heretofore assigned to the accomplishment of this item shall be used as required in the accomplishment of other items remaining on this contract."
- (3) By adding to Exhibit "1", Item 12-9:
- "As of the effective date of Change Order No. 11 to this contract, no further work on the set of parts call for by this item shall be accomplished and any parts heretofore assigned to the accomplishment of this item shall be used as required in the accomplishment of other items remaining on the contract."
- (4) By adding to Exhibit "2", Item 12-12:
- As of the effective date of Change Order No. 11 to this contract no further work shall be accomplished on this item, and any parts heretofore assigned to the accomplishment of this item shall be used as required in the accomplishment of other items remaining on this contract.
- (5) Item 16 is hereby deleted in its entirety.
- (6) Item 15 is hereby amended to read as follows:
- "Item 15 – Build one (1) XR-7755-3 engine in accordance with the requirements of Contractor's Specification No. 2031-A dated 4 June 1945 with such modifications thereto as may be agreed upon between the Contractor and the Chief, Power Plant Laboratory, using the parts produced under Item 12-8 of Exhibit 1 to Item 12 hereto, and one reduction gear unit assembled under Item 13 hereof. Provide the necessary redesign, parts and testing required for one hundred (100) hours of testing to include a fifty (50) hour flight approval test, if testing time permits on the XR-7755-3 engine built under this item. The XR=7755-7 engine may be built and tested under this item in lieu of the XR-7755-3 engine if availability of adequate fuel injection equipment permits. Said XR-7755-7 engine shall be in accordance with Lycoming Model Specification No. 2031-A dated 4 June 1945 except fuel injection shall be provided in lieu of carburetion. Such flight approval test shall be conducted in accordance with Army Air Force Specification No. XR-28398-A, Amendment No. 1 dated 27 January 1944 with the following exceptions:
- (a) A-1. Fuel shall conform to Specification AN-F-33.
- (b) F-1. General – This paragraph shall be amended to read: Aircraft engines and test apparatus shall be subject to inspection by authorized Government representatives who shall be given all necessary facilities to determine conformance with this specification. Unless otherwise specifically authorized, all tests under this specification shall be conducted at the Contractor's Laboratory.
- (c) F-3c. Power Calibrations – All power calibration runs shall be conducted at simulate sea level conditions.
- (d) F-3d. Following the power calibration, the engine shall be given the following 50-hour endurance test, all of which shall be a simulated seal level operating conditions on a rigid test stand.
- (e) F-3d(1). The first 15 hours shall be composed of alternate periods of 30 minutes at military rated power and speed ratings specified in Lycoming Specification No. 2020-C dated 4 June 1945, and 30 minutes at 40 to 50 percent of military rated power and at a speed to be determined from the propeller load curve.
- (f) F-4h. Accessory Drives – Unless otherwise authorized by the Procuring Agency, actual accessories or suitable loading devices, the type of each to be acceptable to the Government, shall be installed on all accessory drives and operated at normal loads during the 35 hours of endurance running specified in Paragraphs F-3d(2) and F-3d(3). Power calibrations of engine shall be made without loading accessory drives. Accessories required under this paragraph shall be furnished by the Procuring Agency.
- (g) F-4i. Inspection and Adjustments – Valve clearance adjustments, ignition breaker inspection and adjustment, spark plug cleaning and general resetting of gaps, oil cleaner inspection and cleaning and general external visual inspection of the engine, shall be made at the conclusion of the first 15 hours of operation and at such other times as considered advisable by the Contractor. Replacement of spark plugs prior to the completion of the approval test shall be at the option of the contractor. Disassembly of the engine to any extent prior to the final tear-down inspection, except for the purposes stated above, shall be at the option of the Contractor.
- (h) F-4n(1) Amend the first sentence to read, "During the first 15 hours of operation at least the following data shall be recorded for each 30 minute period".
- (e) Article 4 is hereby amended:
- Delivery for certain items is hereby extended as follows:
| Item 8 | to 30 Jun 1948 |
| Item 12-2 | to 30 Jun 1948 |
| Item 12-4 | to 30 Jun 1948 |
| Item 13 | to 30 Jun 1948 |
| Item 14 | to 30 Jun 1948 |
| Item 15 | to 30 Sep 1948 |
- Paragraph (b), Article 3 of said contract, as amended, is hereby amended by adding thereto the following new sub-paragraph (6):
- "(6) Notwithstanding the provisions of paragraph (b) above and of T.D. 500 referred to therein, the Contractor shall be paid and amount for all factory overhead indirect charges in lieu of the actual costs thereof, equal to 276% of the salaries and wages of shop labor directly engaged in the performance of this contract, for the period 1 Dec 1946 to 30 Sep 1948 or the completion of performance of work under the contract, which ever is longer – it having been determined by the Contracting Officer and agreed to by the Contractor that this represents a reasonable and proper proportionate share of all of the Contractor's factory overhead and indirect expense applicable and allowable to the performance of this contract excluding any expenditures or items of cost for which direct reimbursement is provided elsewhere in this contract."
3. As a result of the foregoing changes the changes in estimated cost and fixed fee therefore are computed as set forth below, however, the total amount of the reduction shall not be removed from the contract but shall remain in the amount of funds allocated to the contract as set forth in Article 6 of said contract:
-
| Item | Estimated Cost |
| 12-2 and 12-4 | $105,000.00 |
| 12-9 | $80,000.00 |
| 12-12 | $47,000.00 |
| 16 | $68,000.00 |
| Total reduction in estimated costs of work to be accomplished | $300,000.00 |
| 14 | 29,000.00 |
| 15 | 7,000.00 |
| 8 | 70,000.00 |
| Total estimated cost of additional work | $106,000.00 |
| Net reduction in estimated cost of work to be accomplished | $194,000.00 |
| Reduction in fixed fee at 4% | $7,760.00 |
In conformity with the above, Sub-paragraph (1) of Article 3 is hereby amended to read:
- "(1) In addition the Government will pay the contractor for work performed pursuant to Item 12 of Article 1 (a) hereof a fixed fee of four percent (4%) of the estimated cost set forth in all Exhibits approved and attached hereto and made a part hereof as provided in said Item 12 and as said Exhibits may be amended by Supplemental Agreement or Change Order hereto. Further, the Government will pay the Contractor for work performed pursuant to Items 8 and 13 to 16 inclusive of Article 1 (a) hereof a fixed fee of Twenty-One Thousand Seven Hundred Three Dollars and Eighty-Eight Cents ($21,703.88)(being 4% of the estimated cost of additional work required under Item 8 and Item 13 to 16 inclusive).
- There shall be no adjustment in the amount of the fixed fee nor shall there be any claim for increased compensation because of any error and/or omission made in computing the original estimated cost or because of the fact that the estimated cost varies from the actual cost."
4. Nothing herein contained shall be deemed to require the contractor to manufacture, furnish or deliver any articles or supplies, or to perform any work, as to which a Notice of Termination is in effect, at the effective date hereof, nor to require the Government to accept any such articles, supplies or work; and any such Notice of Termination shall be applicable, to the extent stated therein, to any articles, supplies or work called for hereby or otherwise referred to herein. [RG 342 RD2311. XR-7755 Contract W-33-038AC-564. Supplement Agreements, CCNs, Change Orders. 480527001-011.]
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