TCDS 1H4

Page No. 1 2 3 4 5 6 7 8 9 10 Rev. No. 34 32 32 32 32 32 32 32 32 32 DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION 1H4 REVISION 34 Centerpointe Aerospace Inc. S-55 S-55B S-55C MILITARY MODELS (See NOTE 7) September 19, 2019 HELICOPTER SPECIFICATION NO. 1H4 Type Certif icate Holder Centerpointe Aerospace Inc. 279 Blackland Road Royse City, TX 75189 Type Certificate Holder Record California Helicopter Airways Inc, became Centerpointe Aerospace Inc. on September 19, 2019. I. MODEL NUMBER: Engines Fuel Engine Limits 35.0 i n. Hg., 2,200 rpm (550 hp) Straight line manifold pressure variation with altitude to 8,000 ft. 33.0 in. Hg., 2,200 rpm (550 hp) Takeoff (one minute) 36.5 in. Hg., 2,250 rpm (600 hp) Rotor Limits: M aximum 245 rpm / Minimum 170 rpm Airspeed Lim its Never exceed 95 knots CAS C.G. Range (+125.0) to (+ 136.0) Empty Weight C.G. Range None Maximum Wei ght 7,200 lb. Number of Seats Nin e. (Pilot & co-pilot at +99; 2 passengers at +102; 2 passengers at +153, 3 passengers at +190) Maximum Baggage 250 l b. (+217). (See Note 5 for cargo capacity) Fuel Capacity 140 ga l (+116). (See Item 107 for auxiliary tank and Note 4 regarding unusable fuel) Oil Capacity 9.4 ga l. (+77) Sikorsky Aircraft transferred TC 1H4 to California Helicopter Airways Inc. on May 06, 2015. S-55, 9-12 PCLH. Approved 03/25/52 S-55C, 9-12 PCLH. Approved 10/03/56 (Model S-55C is the same as Model S-55 except for an inclined tail cone and minor modifications. See Item 207 for amphibious gear and Items 208, 209, and 210 for float gears.) P &W Wasp S1H2 (See Item 101 for optional engines) 80/87 minimum grade aviation gasoline Maximum continuous Sea Level 1H4 2 Rot or Blade Movements For rigging information, refer to Maintenance Manual. S erial Numbers Eligible See Note 7. Re quired Equipment In addition to the pertinent required basic equipment specified in CAR 6, the following items of equipment must be installed: 102, 103, 104, 105, 106, 201(a), 202, 205(a), 206, 301(a) or (b), 302, 303, 401(a), 603. Specifications pertinent to all models: Da tum 130.6 in. forward of center of main rotor hub. L eveling Means Plumb line from top of cargo door frame. Ce rtification Basis Type Certificate No. 1H4 (CAR 6, May 1946) P roduction Basis: Production Certificate No. 105 E quipment A plus (+) or a minus (-) sign preceding the weight of an item indicates net weight change when that item is available. Engine and Engine Accessories - Fuel and Oil System Net Weight Change 101. Engines (a) P&W Military R-1340-57 (same limitations as for S1H2) None (b) P&W Military R-1340-49M1 865 lb. (+48) Engine limits Maximum continuous Sea level: 34.0 in. Hg., 2,200 rpm (550 hp) Straight line manifold pressure variation with altitude to 5,000 ft.: 32.5 in. Hg., 2,200 rpm (550 hp) Takeoff (1 minute): 36.0 in. Hg., 2,250 rpm (600 hp) (c) P&W Military R-1340-40 Same limitations as for R-1340-49M1 865 lb. (+48) (d) Canadian-built P&W S1H2 Same limitations and weights as for S1H2 engines (e) Canadian-built P&W S3H2 Same limitations as R1340-40. See 101(c) 102. Starter Model AN4116L3 or AN4116L7B 28 lb. (+29) 103. Auxiliary Fuel Pump, Electric (a) Thompson Model TF 36800-1 3 lb. (+41) (b) Lear-Romec Model RG 9790-3A 6 lb. (+41) (c) Adel Model 26900-1 or -3 2 lb. (+41) (d) Adel Model 24000-1 or -3 3 lb. (+41) 104. Fuel pump, engine-driven, Model AN4100-1 3 lb. (+41) 105. Oil cooler, engine, Harrison Radiator Co. No. 8518060 or No. 8520619 17 lb. (+72) 106. Oil cooler, transmission, Harrison Radiator Co. No. 8517955; Fan, transmission, Sikorsky Dwg. S14-35-5053 26 lb. (+165) 107. Auxiliary 85 gal fuel tank installation in accordance with Sikorsky Dwg. S14-30-6280, fuel arm at (+184). Load adjuster required with this installation. Fuel tank 13 lb. (+184) Fuel transfer pump 4 lb. (+175) 3 1H4 Landing Gear 201. Two main wheel-brake assemblies, 6.50-10, Type III (a) Goodyear Model L610HBM 20 lb. (+186) Wheel assembly No. 530858M, 9530853, or 9531954 Brake assembly No. 9520926 202. Two main wheel, 6-ply rating tires, 7.50-10, Type III, with regular tubes 33 lb. (+186) 205. Two nose wheel assemblies, 6.06-06, Type III (a) Goodyear Model L6MBD 8 lb. (+60) Wheel Assembly No. 511500-M 206. Two nose wheel, 6-ply rating tires, 6.00-6, Type III, with regular tubes 15 lb. (+60) 207. Amphibious gear installed in accordance with Sikorsky Dwg. S14-25-6100: Float assembly 410 lb. (+117) Nose wheel assembly 78 lb. (+6) Main wheel assembly 59 lb. (+203) Float struts, tubes, etc. 44 lb. (+84) Airspeed limit: Never exceed 85 knots CAS. Maximum weight: 6,835 lb. 208. Inflatable type float gear installed in accordance with Sikorsky Dwg. S14-25-6250. Removable portion (with S14-25-6251 or S14-25-6316 dampers) 307 lb. (+139) Removable portion (with S14-25-6288 dampers) 296 lb. (+139) Permanent portion (fuselage modification) 8 lb. (+106) Item 401(g) required with this installation. 209. Emergency inflatable float gear installed in accordance with Sikorsky Dwg. S14-25-6350. 170 lb. (+124) Item 401(h) required with this installation 210. Fixed emergency float gear installed in accordance with Sikorsky Dwg. S14-25-6450. 169 lb. (+106) Exhaust modification in accordance with Sikorsky Dwg. S14-05-3183 required. Item 401(j) required with this installation Electrical Equipment 301. Generator (a) (1) 24V, 200 Amp., Eclipse-Pioneer 30E18 40 lb. (+148) (2) 24V, 200 Amp., General Electric 2CM63C 34 lb. (+148) (b) 24 V, 100 amp., Eclipse-Pioneer 901-9 28 lb. (+148) 302. Battery (a) 24V, 36 Amp. Hr., Model AN3150-2 80 lb. (+212) (b) 24V, 24 Amp. Hr., Model AN3151-2 56 lb. (+212) 303. Two inverters, 115V, A.C. 400 cycle 3 phase, 250 V.A. output, Jack-Heintz Model 36 lb. (+230) F15-2 or Eclipse Model 12143-1-A 304. Two landing lights (a) 24V, 600W, Model AN3095-9 (with Item 302(a) only) 13 lb. (+214) (b) 24V, 250W, Model AN3095-8 13 lb. (+214) 1H4 4 Interior Equipment 401. (a) FAA Approved Helicopter Flight Manual, dated 4 January 1954, revised 9 July 1957. This issue supersedes issue dated 25 March 1952. (b) Supplement dated 29 August 1952, revised 25 August 1955 to FAA Approved Helicopter Flight Manual. Contains operational information for Items 601 and 602. (c) (d) (e) (f) Deleted 25 June 1954. (g) Supplement dated 7 December 1954, revised 9 July 1957, to FAA Approved (h) Supplement dated 20 December 1955, revised 17 March 1959, to FAA Approved Helicopter Flight Manual. Required when Item 209 is installed. (i) Supplement dated 29 January 1956 to FAA Approved Helicopter Flight Manual. Contains operational information for Item 606. (j) Supplement dated 17 August 1956, revised 9 July 1957, to FAA Approved Helicopter Flight Manual. Required when Item 210 is installed. (k) Deleted 17 October 1962. (l) Supplement dated 21 February 1957, to FAA Approved Helicopter Flight Manual. Contains operational information for Item 607. 402. Troop Seats, Military Specification MIL-S-5804 (a) 3-place seat 12 lb. (+100) (b) 4-place seat 21 lb. (+165) (c) 3-place seat 13 lb. (+176) Miscellaneous Equipment (not listed above) 601. Hydraulic hoist installation in accordance with Sikorsky Dwg. No. S14-50-2240 External hoist portion 17 lb. (+117) Internal hoist winch 27 lb. (+215) Hoist guillotine and cable guard 2 lb. (+156) See Note 6 for operating limitations. 602. Cargo sling installation in accordance with Sikorsky Dwg. No. S14-50-2500 See Note 6 for operating limitations. 603. Fixed stabilizer installation in accordance with Sikorsky Dwg. S14-40-8211 Neglect and Sikorsky Service Information Circular 1440-298 Supp. 3. (Required only for 7,200 lb.). 604. Tail rotor assembly, S14-15-1500-5 (105 inch diameter). Installed in accordance with Sikorsky Service Information Circular No. 1415-444, dated 18 February 1954, and Revision A, dated 25 August 1954. See Service Information Circular for weight change. 605. Main rotor blades installed in accordance with Sikorsky Dwg. No. S14-10-2100. +8 lb. (+131) 606. Hydraulic Hoist Installation in accordance with Sikorsky Dwg. No. S14-05-5021 With Breeze Winch P/N BL 413 109 lb. (+137) With Breeze Winch P/N BL 1315 94 lb. (+137) See Note 6 for operating limitations. 607. Cargo sling installation in accordance with Sikorsky Dwg. No. S14-50-2530. See Note 6 for operating limitations. 608. Inclined tail cone installation in accordance with Sikorsky Kit Dwg. S14-05-2134 (S-55 only) +26 lb. (+391) NOTE 1: Current weight and balance report including list of equipment included in certificated weight empty, and loading instructions must be in each helicopter at the time of original certification and at all times thereafter. In the case of air carrier operators having an approved weight control system, the weight and balance report need not be in the helicopter. When changes are made to the helicopter which affect weight and balance, see instructions contained in Section IV of the Flight Manual. 5 1H4 NOTE 2: The following placards must be displayed on the instrument panel in full view of the pilot: (a) "This helicopter must be operated in compliance with the operating limitations specified in the FAA Approved Rotorcraft Flight Manual." (b) Deleted 25 June 1954. (c) Deleted 25 June 1954. (d) "Decrease VNE 4.5 knots per 1,000 ft. altitude." (e) "Manifold Pressure Placard": P&W R1340-57, S1H2 Engines P&W R1340-40, -49M1 Engines M.P. at 2,200 R.P.M. M.P. at 2,200 R.P.M. For level flight only For level flight only ALT. M.P. IN. BG. ALT. M.P. IN. HG. S.L. 35.0 S.L. 34.0 2,000 31.5 2,000 30.5 4,000 28.5 4,000 27.5 6,000 26.0 6,000 25.0 8,000 23.5 8,000 22.5 10,000 22.0 10,000 21.0 (f) "During ground idling left window must be closed to prevent excessive carbon monoxide in pilot's compartment." (g) "With Amphibious Gear installed decrease VNE 4.5 knots per 1,000 ft. altitude above 2,000 ft." (Required when Item 207 is installed.) NOTE 3: Information essential to the proper maintenance of the helicopter including retirement time of critical parts is contained in the Sikorsky S-55 Maintenance Manual provided with each helicopter. These values of retirement or service life should not be increased without FAA engineering approval. NOTE 4: Fuel and oil capacities as indicated are total tank capacities. The forward fuel tank capacity includes unusable fuel of 4.75 gal., the aft fuel tank (auxiliary) includes unusable fuel of 2.5 gal., which must be included in the empty weight. These values correspond to the rotorcraft ground altitude which is 1-1/2° nose up. NOTE 5: The cabin floor area between Stations 84 and 206 is structurally satisfactory for a uniformly distributed loading of 175 p.s.f. when used for cargo purposes. NOTE 6: The hydraulic hoist (Items 601, 606) and the cargo sling (Items 602, 607) are special purpose equipment and are to be operated in accordance with the limitations described in CAR 8. Information concerning the operating limitations is also contained in the Helicopter Flight Manual. 1H4 6 NOTE 7: The following serial numbers are eligible: GROUP A: COMMERCIAL MODELS SERIAL SERIAL SERIAL SERIAL SERIAL SERIAL SERIAL SERIAL SERIAL NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER 55034 55100 55143 55160 55161 55252 55270 55278 55279 55292 55306 55325 55383 55385 55389 55433 55434 55458 55482 55507 55508 55532 55533 55558 55559 55560 55561 55584 55585 55586 55587 55610 55633 55670 55671 55690 55691 55692 55707 55708 55725 55726 55727 55728 55743 55744 55745 55750 55757 55758 55759 55770 55771 55772 55773 55785 55791 55808 55825 55838 55840 55841 55842 55879 55880 55881 55882 55883 55884 55888 55889 55890 55896 55897 55903 55904 55910 55911 55912 55928 55939 55940 55960 55981 55992 551002 551003 551004 551005 551015C 551020A 551022C 551050C 551059C 551067C 551068C 551070C 551077C 551078C 551089C 551090C 551109C 551113C 551114C 551115C 551122C 551123C 551124C 551133C 551134C 551143C 551144C 551145C 551154C 551155C 551156C 551164C 551165C 551166C 551174C 551175C 551183C 551190 551206 551207 551215 551222 551223 551224 551225 GROUP B: MILITARY CONVERSIONS The following serial numbers refer to military helicopters that have been converted to S-55B for identification purposes only: 55617: Eligible for certification as a modified version of the S-55 and is known as the S-55B for identification purposes. The modifications include incorporation of the Wright R-1300-3 engine, hydromechanical clutch and electrical and fuel system changes. Item 401(a) and revision No. 1 dated 9 March 1959 required for Serial No. 55617. 1328: (Military serial number.) An S-55B helicopter (surplus military UH-19G) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued May 10, 1978. 55020: Surplus military HRS-1 helicopter (counterpart of the commercial S-55) and is eligible for certification as modified by Nayak Aviation Corporation, 206 E. Terminal Drive, International Airport, San Antonio, Texas. Standard Airworthiness Certificates issued. 55040: Surplus military HRS-1 helicopter (counterpart of the commercial S-55) and is eligible for certification as modified by Airnews, Inc., International Airport, San Antonio, Texas. 55068: Surplus military HRS-1 helicopter (counterpart of the commercial S-55) and is eligible for certification as modified by Nayak Aviation Corporation, 206 E. Terminal Drive, International Airport, San Antonio, Texas. Standard Airworthiness Certificates issued. 7 1H4 55079: Surplus military HRS-1 helicopter (counterpart of the commercial S-55) and is eligible for certification as modified by Nayak Aviation Corporation, 206 E. Terminal Drive, International Airport, San Antonio, Texas. Standard Airworthiness Certificates issued. 55102: An S-55B helicopter (surplus military HRS-3) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued September 5, 1973. 55-105: An S-55 helicopter which is eligible for certification as an S-55B as modified by California Helicopter Parts, Inc., Sun Valley, California. 55106: An S-55B helicopter (surplus military HRS-3) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued June 26, 1974. 55124: Surplus military H-19A helicopter (counterpart of the commercial S-55) and is eligible for certification as modified by World Helicopters, Inc., 2801 E. Spring Street, Long Beach, California. 55188: Surplus military HRS-3 helicopter (counterpart of the commercial S-55) and is eligible for certification as an S-55B as modified by Olympic Helicopters, Inc., 8241 Perimeter Road, Boeing Field, Seattle, Washington. Standard Airworthiness Certificate issued April 25, 1969. 55-213: An S-55B helicopter (surplus military CH-19E) as modified by Orlando Helicopters Airways, Inc., P.O. Box 2802, Orlando, Florida 32802. Standard Airworthiness Certificate issued 30 January 1973. 55231: An S-55B helicopter (surplus military HRS-3) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued September 6, 1973. 55239: An S-55B helicopter (surplus military CH-19E) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued August 30, 1977. 55260: An S-55B helicopter (surplus military HRS-3) as modified by Helitec Corporation, Mesa, Arizona. Standard Airworthiness Certificate issued July 7, 1975. 55-324: An S-55B helicopter (surplus military UH-19B) and is eligible for certification as modified by Deltaire Industries Ltd., 474 Agar Drive, International Airport, South, Vancouver, B.C., Canada, subject to FAA determination of conformity to Sikorsky Civil Certification Report No. 37, dated 20 April 1972. 55337: An S-55B helicopter (surplus military H-19E) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued April 24, 1978. 55-452: An S-55B helicopter (surplus military CH-19E) as modified by Orlando Helicopters Airways, Inc., P.O. Box 2802, Orlando, Florida 32802. Standard Airworthiness Certificate issued 16 November 1972. 55503: An S-55B helicopter (surplus military HO4S-3) as modified by Air International, P.O. Box 603, Miami, Florida. Standard Airworthiness Certificate issued October 2, 1967. 55577: An S-55B helicopter (surplus military HO4S-3) as modified by Aviation Specialties Co., Mesa, Arizona. Standard Airworthiness Certificate issued. 55579: An S-55B helicopter (surplus military HO4S-3) as modified by Aviation Specialties, Mesa, Arizona. Standard Airworthiness Certificate issued July 27, 1973. 55582: An S-55B helicopter (surplus military HO4S-3) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued February 22, 1973. 1H4 8 55606: An S-55B helicopter (surplus military HO4S-3) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued June 6, 1973. 55-645: An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopters Airways, Inc., P.O. Box 2802, Orlando, Florida 32802. Standard Airworthiness Certificate issued 23 December 1971. 55646: An S-55B helicopter (surplus military H-19D) as modified by Helitec Corporation, Mesa, Arizona. Standard Airworthiness Certificate issued June 16, 1975. 55648: An S-55B helicopter (surplus military H-19D) as modified by Helitec Corporation, Mesa, Arizona. Standard Airworthiness Certificate issued June 28, 1974. 55710: An S-55B helicopter (surplus military HO4S-36, serial number 1307) as modified by Midwest Helicopter Airways, Inc., Madison & Frontage Roads, Hinsdale IL 60521. Standard Airworthiness Certificate issued February 12, 1981. 55-834: An S-55B helicopter (surplus military UH-19D) as modified by Apollo Helicopter, Inc., 22102 E. 40 Highway, Blue Springs, Missouri 64015. The modification includes incorporation of the Wright R-1300-3C engine, hydromechanical clutch, electrical and fuel system changes and STC SH16CE. Standard Airworthiness Certificate issued 1 December 1972. 55907: Surplus military H-19D helicopter (counterpart of the commercial S-55) and is eligible for certification as modified by Sky Van Airways, 2735 E. Spring Street, Long Beach, California. 55955: An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued May 25, 1976. 55965: An S-55B helicopter (surplus military H-19D3) as modified by Helitec Corporation, Mesa, Arizona. Standard Airworthiness Certificate issued July 12, 1974. 55989: Surplus military HRS-3 helicopter (counterpart of the commercial S-55) and is eligible for certification as an S-55B as modified by Aviation Specialties, Inc., 4930 E. Falcon Drive, Mesa, Arizona. Standard Airworthiness Certificate issued June 19, 1970. 55-993: An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopters Airways, Inc., P.O. Box 2802, Orlando, Florida 32802. Standard Airworthiness Certificate issued 13 April 1972. 130168: (Military serial number.) An S-55B helicopter (surplus military HRS-3) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued August 30, 1977. 551017: An S-55B helicopter (surplus military H-19D4) as modified by Western Helicopters, Rialto, California. Standard Airworthiness Certificate issued October 23, 1973. 551028: An S-55B helicopter (surplus military H-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued April 5, 1973. 551046: Surplus military H-19D helicopter (counterpart of the commercial S-55) and is eligible for certification as an S-55B as modified by Chicago Helicopter Airways, Midway Airport, Chicago, Illinois. Standard Airworthiness Certificate issued. 55-1063: A commercial S-55B helicopter (surplus military H-19D) as modified by Western Helicopters, Inc., P.O. Box 579, Rialto, California 92376. The modification includes incorporation of the Wright R-1300-3 engine, hydromechanical clutch and electrical and fuel system changes. Standard Airworthiness Certificate issued 20 April 1972. 9 1H4 551121: An S-55B helicopter (surplus military H-19D4) as modified by Helitec Corporation, Mesa, Arizona. Standard Airworthiness Certificate issued June 14, 1974. 551130: An S-55B helicopter (surplus military H-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued June 7, 1973. 551135: Surplus military HO4S-3G helicopter (counterpart of the commercial S-55) and is eligible for certification as an S-55B as modified by Canadian Helicopters Overhauls Ltd., Vancouver International Airport, Vancouver B.C., Canada. Standard Airworthiness Certificate issued March 27, 1969. 55-1148: An S-55B helicopter (surplus military H-19D4) as modified by Carson Helicopters, Inc., 32H Blooming Glen Road, Perkasie, PA. Standard Airworthiness Certificate issued on August 22, 1972. 551186: An S-55B helicopter (surplus military H-19D5) as modified by Aviation Specialties, Mesa, Arizona. Standard Airworthiness Certificate issued September 22, 1971. 551209: An S-55B helicopter (surplus military H-19D5) as modified by Apollo Helicopters, Blue Springs, Missouri. Standard Airworthiness Certificate issued September 13, 1977. 55-1248: An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopters Airways, Inc., P.O. Box 2802, Orlando, Florida 32802. Standard Airworthiness Certificate issued 21 September 1972. 55-1273: An S-55B helicopter (surplus military H-19D5) as modified by Aviation Specialties, Inc., 4600 East McKellips Road, Falcon Field, Mesa, Arizona 85201. Standard Airworthiness Certificate issued 12 October 1972. 56-1549: (Military serial number.) An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued October 20, 1975. 57-1616: (Military serial number.) An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued December 1, 1980. 57-1626: (Military serial number.) An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued June 19, 1981. 57-5928: (Military serial number.) An S-55B helicopter (surplus military UH-19D) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued March 20, 1981. 57-5962: (Military serial number.) An S-55B helicopter (surplus military UH-19B) as modified by Orlando Helicopter Airways, P.O. Box 2802, Orlando, Florida. Standard Airworthiness Certificate issued September 25, 1979. GROUP C: CONVERSIONS FROM S-55 TO S-55B MODELS The following serial numbers refer to helicopters which have been converted from standard S-55 models to S- 55B models for identification purposes only: 55270: An S-55 helicopter which is eligible for certification as an S-55B as modified by Carson Helicopters, Inc., 32H Blooming Glen Road, Perkasie, Pennsylvania. 1H4 10 55325: An S-55 helicopter which is eligible for certification as an S-55B as modified by Carson Helicopters, Inc., 32H Blooming Glen Road, Perkasie, Pennsylvania. 55883: An S-55 helicopter which is eligible for certification as an S-55B, as modified by Orlando Helicopter Airways, Inc., PO Box 2802, Orlando, Florida, 32802. This modification includes incorporation of Sikorsky Service Bulletin No. 38. A standard Airworthiness Certificate was issued on July 19, 1989. 55907: An S-55 helicopter which is eligible for certification as an S-55B as modified by Carson