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25OC20 CSL-1024COMMERCIAL SERVICE LETTER

Detroit Diesel Allisonp Inclia~apolis. &Jima 46206 Page 1 of 7October 25, 1973FAA-DER Approved

SUBJECT: Inspection of MC-40 Fuel Control and Governor Speed RotorWeightsInvestigation of fuel controls and governors have revealedspeed rotor assemblies with rotor weights that were notproperly processed. As a result, operational problemsmay occur during start, e.g. stagnation, Nl acce lerationto 80% rpm, or unstable N2 rpm.CECO authorized personnel will accom plish this inspectionas soon as possible on the units listed in Table 1. Eachinspected unit will also be identified with the letter Rstamped on the unpainted area adjacent to Colt Industries.

EFFECTIVITY : Inspect those units listed in Table 1.COMPLIANCE: To be accomplished by CECO authorized personnel as

soon as possible.MATERIAL AVAILABILITY:

Part No.94187MS16632-4012

SPECIAL TOOLING:

Nomen.clatureSpeed Rotor WeightRing, Retaining

Part No.STD67229STD67203

Nomenclature--WrenchInserter

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250-C20 CSL-1024Page 2

COMMERCIAL SERVICE LETTERTABLE 1. SERIAL NO. EFFECTIVITY

YfwELcoNTRoL GOVERNORP/N 6851506 P/N 6851468 P/N6851407(CECO10400OA8) jCECO104100A6) OR (CECO104500Al)AAC46, 51, 54, 56, 60,6l, 66, 59,70,76, 90, 101, 112, 116, 138,141,144, 152, 154, 169, 177,A78, 181,188, 201, 207 208, 210, 7.17, 220,222,223, 225, 231, 241,242, 256,263, 276,277,297, 299, 303, 308,310,311, 319, 322, 326, 331, 373,376, 379, 381, 394, 401, 412,413,416, 417, 425, 426, 430, 433, 453,479. 485. 493. 505. 507. 508. 511.532; 536; 537; 541; 552; 556; 582,'583, 585, 608, 621, 636, 655, 662,654, 675 696, 700, 708, 738, 740,743, 780, 796, 798, 806, 808, 811,815, 833, 834, 837, 839,842, 844,846, 850, 862, 874, 8'76, 890, 891,923, 928, 936, 997, 1014, 1031,1037, 1379, 1393, 1416, 1425,1458,1712, 1717, 1718, 1720-1722, 1725,1727, 1729, 1730, 1732, 1737-1739,1'741-1748. 1750-1768. 1770-1780.l781-1783; 1785-1787; 1790-1796;l798.1799, iani- lail , 1613-1837,1839-1905, 1908-1911, 1915-1930,

1933-1948. 1950.1954, 195G-1967.1969-1976, 1978-19a2, 1984, 1986,1988-1990. 1993. 1994. 199G-1998.2000, 2OOi2010; 2012-2015, 2017:2019, 2021-2038, 2039-2045, 2047-2056, 2058-2064, 2066, 2063-2070,2074, 207G-2078, 2080-2082, 2084-2089, 2091, 2094,2095, 2097,2098,2102-2132, 2144-2146, 2156, 2158,2163, 2168, 2170, 2177-2179, 2183,2186, 2189, 2193, 2195-2197, 2199,2201, 2203, 2206, 2207, 2383, 2384

AAD43, 46, 53, 59, 62, 64, 69, ACK90-98, 103-107, 113-129,76, 77, 83, 98, 101, 113, 117, 131-139, 143,144, 146,120, 122, 129, 132, 137, 144, 148, 149, 153, 154, 161,164. 166. 170, 176. 197. 208. 173. 174. 2117213; 217; 219; 240; 241; 247;261, 262, 274, 279, 288, 294,304, 305, 308, 311, 313, 314,319, 321, 322,327, 334-336,351, 353, 355, 364, 368, 384,390. 396.401. 410. 416. 417.419; 421; 426, 436, 44i, 446,462,465, 469, 471, 487, 488,491. 492. 499.514. 516. 518.520; 525,' 536,' 539; 551; 560;566, 569, 591, 594, 599, 604,613, 625, 627, 640,642, 644-646, 648, 654, 660, 673, 676,682, 699, 704, 705, 709, 719,721, 723, 742, 746-748, 750,757, 775, 781, 807, 826, 833,864. 869. 892. 896. 901. 904.921; 951; 958; 968; 977; 991;998, 1016, 1020, 1032, 1066,1068, 1155,1156, 1194, 1262,1341-1343, 1370, 1374, 1396,1400, 1404, 1423, 1~502, 1603,1620, 1621, 1623, 1626, 1627,1629-1633, 1635-1639, 1641,1642, 1644, 1645, 1647, 1649,1653-1656, 1658, 1659, 1661,16F3, 1664, 1666-1668, 1670-1672, 1674-1702, 1704-1711,1713, 1714, 2012, 2016-2019,2020, 2022-2030. 2032-2041,2043-2094, 2096-2162, 2164,2165, 2167, 2071-2205, 2207,2209-2211. 2213-2215, 2217,2219, 2226, 2223, 22i6-223i,2234-2254. 2263. 2264. 2268.2270, 2274, 2275, 2275, 228%2284, 2340, 2341, 2347-2349,2351, 2353, 2354, 2356, 2357,2361. 2364, 2368-2387, 2390,2393.

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250-C20 CSL-1024Page 3COMMERCIAL SERVICE LETTER

STANDARD TOOLHNG:Pointed TweezersR-,Stamp, l/16 InchLip-type Micrometer (or Venier Calipers)

REFERENCE: CECO Product Support Information Letter MC40-6-73PROCEDURE: 1. Inspect Speed Rotor Weights. (See F&m e 1. )

a. Remove Fue l Controls and Governors from aircraft,shipping containers, etc. Using wrench STD 67229,remove the speed rotor assembly.

b. Inspect the installed weight for c:olor. Acceptable weightwill be completely straw-colored.c. If unacceptable, proceed as follows:

(1) Carefully remove and discard retaining ring (Item 7Figure 1~ and remove speed weight (Item 6).(2) Using tweezers, carefu lly remove spring ,

(Item 8). Exe rcise caution to insure thatshims (Item 9) are not lost.(3) Measure the speed weight b leing removed andthe replacement speed weiglht for X dimension.(See Figure 2).(4) Select replacement speed weight having anx7 dim ension not to exceed plus Or minus0.001 of removed speed weight.

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IN

N

N

AU

P

NM

2 3 R 4 R 5 6 7 8 9

RoAmyS

Cmee

PnPeom

PnPeom

S

Ro

PnPeom

SnHccmeo

PuBe

WegS

RnRann

SnHccmeo

Sm00hc

Sm00hc

Sm00hc

Sm00hc

9 7

0

7

0

9

Gr

7

0

A

9 9

3

-4

iz

9 M 9 9 9

2

9

3

9

4FUCROG

FG

1ACEJN

OAR

RP

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250-C20 CSL-1024Page 5COMMERCIAL SERVICE LETTER

FIGURE 2. MEASURING SPEED WEIGHT

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250X20 CSL-1024Page 6

MJK/bst

COMMERCIAL SERVICE LETTER(5) Install correct amount of removed shims,spring and speed weight. Carefully installnew retaining ring (Item 7, Figure 1) usinginserter STD67203.

d. Once acceptable, reinstall the speed rotor.0)

(2)

(3)

Inspect packings. Lubricate packings witha light coat of petrolatum, FederalSpecification VV-P-236.Install speed rotor assembly using wrenchSTD67229, and tighten with 20-30 inchpounds torque.Stamp the unit nam eplate with the R stampin the unpainted area adjacent to ColtIndustries. Record compliance withCSL-1024 in the Engine Assembly (whitepages) Inspection Record, Part III of theEngine Log Book.

2. DispositionForward the following to:Chandler Evans, Inc.West Hartford, Connecticut 06101Attention: Code R (413951)Place removed speed weight in an envelope and enclosethe following data. See samp le form, Figure 3.a. Unit Serial No.b. Operating timec. Dimension of removed speed weightd. Dimension of replacement speed weighte. Old shims; thickness and quantityf. New shims; thickness and quantity.

L. 0. DavidsonService ManagerAircraft Engines

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250-C20 CSL-1024Page 7COMMERCIAL SERVICE LETTER

Enclosed Speed Weight cc l-8 Serial No. .------------Operating Time cc 45-50 Date Repaired -- -- --MDYDim. X removed Speed WeightDim. X new Speed WeightShims: Added

Removed

cc 51-52 Repaired by ---Initialscc 53-58 Location -----------St&US -------_--------New or Spare

Enclosed Speed WeightOperating TimeDim. X Removed Speed WeightDim. X new Speed WeightShims: Added

Removed

cc l-8 Serial No. ------------cc 45-50 Date Repaired -- -- --M D Ycc 51-52 Repaired -_-:Initialscc 53-58 Location -----------status -------.--------New o.r Spare

Enclosed Speed Weight cc l-8 Serial No. ------------Operating TimeDim. X Removed Speed WeightDim. X new Speed WeightShims: Added

Removed

cc 45-50 Date Repaired -- -_ -_M D Ycc 51-52 Repaired Y 7 -Initialscc 53-58 Location ------------Status -----.--.--------New or Spare

FIGURE 3 SAMPLE FORMRolls-Royce Proprietary Data Uncontrolled Printed Copy