- Holder
- Sikorsky Aircraft Corporation
- Revision
- 12
- Revised
- April 28, 2017
- Status
- Current
- Product
- Aircraft · Rotorcraft
- Certification basis
- Part 21, Part 29
- Models
- 1
The release keeps the latest revision of each data sheet. Model names are as the data sheet lists them.
On this page
Models · 1
| Model | Also known as | Note |
|---|---|---|
| S-70C |
Airworthiness directives · 0
ADs whose products are models on this data sheet, matched by model and maker.
No ADs matched this data sheet’s models
STCs approved under this data sheet · 23
STC SR12058AKInstallation of Recoil Aerospace, Inc. T750-I Internal Fire Suppression TankSTC SR12471ATInstallation of RMCI Health Useage and Monitoring System (HUMS)STC SR00903DEInstallation of Left and Right, Hand Hold, Step and Step Fairing modification
See all 23 STCsWhat the data sheet says
From the PDF’s text layer, line by line: tables lose their columns. The PDF is the record.
PAGE 1 2 3 4 5 6 7 8. 9
REV. 12 10 11 9 11 11 12 12 12
OIL CAPACITY: 7 quarts each engine.
DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
H3NE
REVISION 12
SIKORSKY AIRCRAFT
S-70C
APRIL 28, 2017
TYPE CERTIFICATE DATA SHEET H3NE
This data sheet, which is part of Type Certificate Number H3NE, prescribes conditions and limitations under which the product
for which the Type Certificate was issued meets the airworthiness requirements of the Civil Air Regulations.
TYPE CERTIFICATE (TC)
HOLDER:
Sikorsky Aircraft Corporation
6900 Main Street
Stratford, CT 06497-9129
MODEL NUMBER: S-70C (Restricted Category) Approved: 10/21/83
(Derivative aircraft of U.S. Army Models UH-60A and UH-60L)
ENGINES: 2 General Electric CT 7-2C (See Note 11). See Notes 6 and 13 for optional engines.
FUEL: Aviation Kerosene JP-4, JP-5, JP-8, Jet A, Jet A-1 or Jet B. See Note 6 for optional
engines.
ENGINE LIMITS:
SHAFT POWER TURBINE GAS GEN POWER TURBINE
HP RPM RPM INLET (TGT)
MILITARY POWER (30 MIN.) 1,561 20,900 44,700 850o C
NORMAL CONT. CRUISE 1,318 20,900 44,700 775o C
TRANSMISSION LIMITS: TORQUE:
120% Single Engine
106% Dual Engine
(no time limits)
ROTOR LIMITS: Max. 258 RPM
Min. 232 RPM
AIRSPEED LIMITS: Vne Power on: 193 knots IAS, (221 MPH). See Rotorcraft Flight Manual (Operators
Manual) for variation of Vne with gross weight, pressure altitude and temperature.
MAXIMUM WEIGHT: 22,000 lbs. See Note 8.
MINIMUM CREW: 2 (pilot, copilot)
FUEL CAPACITY: 361.5 gallons; 2 tanks (LH & RH interchangeable).
359.7 gallons; 2 tanks (LH & RH interchangeable) (with fuel boost pumps installed)
H3NE 2
PRODUCTION BASIS:: Production Certificate No. 105 and 8 SO.
C.G. RANGE 347.7 360.2
22,000
A
I
R
C
R
A
F
T
W
E
I
G
H
T
L
B
S
15,900
345.5
13,700
13,400
13,050
366.3
11,500
342.6 358.1
OTHER OPERATING
LIMITATIONS:
SA 4047-70C-55-10 Operator's Manual dated September 14, 1984, as revised. For
aircraft equipped with optional GE CT7-2D engines: SA 4047-70C-55-10 Operator's
Manual dated September 14, 1984, as revised, and Supplements No. 1 and 2, as revised.
For aircraft equipped with optional T700-GE-701A engines: SA 4047-70C55-10
Operator's Manual dated September 14, 1984, as revised, and Supplement No. 1, as
revised. For S/N 701029 only, TM 55-1520-237-10B, Operator's Manual, dated June
22, 1992, as revised. For aircraft with optional T700-GE-700 engines, U.S. Army TM
55-1520-237- 10, dated 8 January 1988, as revised, or U.S. Army TM 1-1520-237-10,
dated 31 August 1994, as revised, is required. (See NOTE 10)
INC
HES
AFT
OF
DAT
UM
DAT
UM:
SERIAL NUMBERS
ELIGIBLE:
Sikorsky Manufacturing Numbers 70583, 70785, 70788, 70792-70794, 70797-70800,
70811-70813, 70830, 70831, 70836, 70837, 70848, 70855, 70856, 70867, 70868,
70879, 70884, 70892, 70910, 70918, 70927-70929, 70949-70951, 70954, 70957-70959,
70965, 70966, and 701029
TYPE CERTIFICATE BASIS: FAR 21.25(a)(2), effective January 6, 1975, for the purpose of:
(1) Agriculture, FAR 21.25(b)(1)
(2) External Cargo, FAR 21.25(b)(7)
(3) Forest and Wildlife Conservation FAR 21.25(b)(2)
FAR 29, Amendments 29-1 through 29-24 for non-U.S. Army approved modifications.
Note: In accordance with 14CFR Part 36.1(a)(4), compliance with the
noise requirements was not shown. Therefore, aircraft certificated
under this Type Certificate are only eligible for agricultural operations
defined in 14CFR 137.3, aerial dispensing of liquids and forest
conservation material as defined by 14CFR 137.3, or external loads as
defined in 14CFR 133.1(b).
3 H3NE
EQUIPMENT: The basic required equipment as prescribed in the applicable airworthiness regulations,
(see Certification Basis) must be installed in each type helicopter for certification. In
addition, the following is required:
(1) SA 4047-70C-55-10 Operator's Manual dated September 14, 1984, as revised, for aircraft
with GE CT7-2C engines. For aircraft with optional GE CT7-2D engines, SA 4047-70C-55-10
Operator's Manual dated September 14, 1984, as revised, and Supplements No. 1 and No. 2, as
revised, are required. For aircraft with optional T700-GE-701A engines, SA 4047-70C-55-10
Operator's Manual dated September 14, 1984, as revised, and Supplement No. 1, as revised, are
required. For S/N 701029, TM 551520-237-10B, Operator's Manual, dated June 22, 1992, as
revised, is required. For aircraft with optional T700-GE-700 engines, U.S. Army TM 55-1520-
237-10, dated 8 January 1988, as revised, or U.S. Army TM 1-1520-237-10, dated 31 August
1994, as revised, is required.
(2) Marking requirements: FAR 91.31c (FAR 45). FAR 91.31c became FAR 91.9c in the
recodification dated August 18, 1989.
(3) Removal of equipment in accordance with the latest FAA approved Revision of Sikorsky
Aircraft Kit Drawing No. 70080-00100 or 70080-95008, and replace with commercial
equipment. Install GE CT7-2C engines or optional engines. See Notes 5 and 6.
NOTE 1: Current weight and balance report, including list of equipment included in certificated
empty weight, and loading instructions must be in each type helicopter at time of original
airworthiness certification and at all times thereafter.
NOTE 2: The following placard must be prominently displayed in the cockpit in full view of the
pilots:
"THIS ROTORCRAFT MUST BE OPERATED IN ACCORDANCE WITH THE
RESTRICTED CATEGORY OPERATING LIMITATIONS OF FAR 91.39." FAR 91.39
became FAR 91.313 in the recodification dated August 18, 1989.
NOTE 3: Prior to the Civil Airworthiness Certification, compliance with Sikorsky Aircraft
document number IILS-L-88-006, dated October 5, 1988, as revised, must be
accomplished.
NOTE 4: For S-70C helicopters with GE CT7-2C engines: Information essential to the proper
maintenance is contained in U.S. Army TM 11-1520-237-23-1 through 3, as revised; TM 11-
1520-237-23P, as revised; TM 55-1520-237-23-1 through -10, as revised; TM 55-1520-237-23P,
23P-1, and 23P-2, as revised; and TM 55-1520-237-PMS-1 and -2, as revised, as supplemented
by SA 4047-70C-55-23-2-1 and SA 4047-70C-55-23-6-1, as revised. Information essential to the
proper maintenance of these engines is contained in TM-55-2840-248-23, as revised,
supplemented with General Electric Publication SEI 660, as revised. Component overhaul
intervals and replacement times shall be in accordance with Table 1-5, Life Limited Components,
of TM 55-1520-237-23-2, as revised, unless superseded by appropriate Airworthiness Directive.
See NOTE 10.
The U.S. Army replaced TM 55-1520-237-23-1 through -10 with a single manual, TM 55-
1520-237-23, composed of 18 chapters and 8 appendices divided into 8 volumes. Either
set of TM's may be used.
Information on civil aircraft serial number correlation to the U.S. Army serial numbers
is contained in Sikorsky Letter TPL-W91-450, dated July 23, 1991, as revised or
Sikorsky Engineering Report SER-51010189 dated 7 June 2016, as revised..
NOTE 5. The military equipment is to be removed and replaced with commercial equipment in
accordance with the latest FAA approved revision of Sikorsky Aircraft Kit Drawing No. 70080-
00100 or 70080-95008.
H3NE 4
For S -70C helicopters with GE CT7 -2D engines: Information essential to the proper
maintenance is contained in SA 4047-70C-55-23-1 through -10, as revised; SA 4047-70C-55-
NOTE 6: Optional engines eligible for installation in the Model S-70C and the applicable
limitations:
Engines: 2 General Electric T700-GE-701A or 2 General Electric CT7-2D, or 2 General
Electric T700-GE-700.
Fuel: JP-4, JP-5, JP-8, Jet A, Jet A-1, or Jet B.
Engine Limits for T700-GE-701A
SHAFT HP POWER TURBINE GAS GEN. POWER TURBINE
(S.L. STD.) RPM RPM INLET (TGT)
Contingency Rated Power (CRP)
(2 1/2 min. OEI)
Maximum Rating
(10 min. dual)
Intermediate Rated Power
(IRP) (30 min. dual)
Maximum Continuous Power
(MCP)
1,723 20,900 44,700 917o C
1,715 20,900 44,700 882o C
1,694 20,900 44,700 867o C
1,510 20,900 44,700 804o C
Engine Limits for CT7-2D:
SHAFT HP POWER TURBINE GAS GEN. POWER TURBINE
(S.L. STD.) RPM RPM INLET (TGT)
2 1/2 min. power (OEI) 1,725 20,900 46,070 911o C
30 min. power (OEI) 1,625 20,900 45,430 873o C
Take-off (5 min.) 1,625 20,900 45,430 873o C
Maximum Continuous
(MCP)
1,595 20,900 45,240 858o C
Engine Limits for T700-GE-700:
SHAFT HP POWER TURBINE GAS GEN. POWER TURBINE
(S.L. STD.) RPM RPM INLET (TGT)
Military Power
(30 min)
1,561 20,900 44,700 850o C
Normal Cont. Cruise 1,318 20,900 44,700 775o C
NOTE 7 For S-70C helicopters with T700-GE-701A engines: Information essential to the proper
maintenance is contained in SA 4047-70C-55-23-1 through -10, as revised, and Supplement
No. 1, as revised, to each of those publications; SA 4047-70C-55-PMS-1 through -2, as
revised, and Supplement No. 1, as revised, to each of those publications; SA 4047-70C-55-
23P, as revised, SA 4047-70C-11-23-1 through -3, as revised, and SA 4047-70C-11-23P, as
revised, and Supplement No. 1, as revised, to each of those publications. Information essential
to the proper maintenance of the engines is contained in General Electric publications SEI-
671 and SEI-675, as revised, and U.S. Army TM 1-2840-248-23&P, as revised. Component
replacement times shall be in accordance with SA 4047-70C-55-23-2, as revised, and
Component replacement times shall be in accordance with Sikorsky Customer Service Notice
No. 70-6, as revised. The U.S. Army replaced TM 55-1520-237-23-1 through -10 with a
single manual, TM 55-1520-237-23, composed of 18 chapters and 8 appendices, divided into
8 volumes. Either set of TM's may be used. (See NOTE 10)
5 H3NE
H3NE 6
PMS-1 through -2, as revised; SA 4047-70C-55-23P, as revised; and appropriate Supplements
No. 2, as revised, to those publications; SA 4047-70C-11-23-1 through -3, as revised; and SA
4047-70C-11-23P, as revised. Information essential to the proper maintenance of the engines is
contained in General Electric Publications SEI-569, SEI-570 and SEI-690. Component
replacement times shall be in accordance with SA 4047- 70C-55-23-2, as revised, and
Supplement No. 2, as revised, unless superseded by appropriate Airworthiness Directive.
Component overhaul intervals shall be in accordance with Sikorsky Customer Service Notice
No. 70-6. The U.S. Army replaced TM 55 -1520-237-23-1 through -10 with a single manual,
TM 55 -1520-237-23, composed of 18 chapters and 8 appendices, divided into 8 volumes.
Either set of TM's may be used. (See NOTE 10)
For S -70C helicopters with T700-GE -700 engines: Information essential to the proper
maintenance is contained in the U.S. Army Manuals listed in NOTE 10.
Information on civil aircraft serial number correlation with U.S. Army serial numbers is
contained in Sikorsky Letter TPL -W91-450, dated July 23, 1991, as revised or Engineering
Report SER-51010189 dated 7 June 2016, as revised .
NOTE 8: S-70C aircraft not modified with Stabilator Amplifier P/N 70902-02001-045, Pitot Static
Probe Support Assembly P/N 70219-02141-041 (left side), -042 (right side), and Pitot
Static Probe Fairing Assembly P/N 70219-02141-043 (left side), -044 (right side), and
engine shaft stud balance (MWO 55-1520-237- 50-58 or MWO 55-1520-237-50 -73 are
restricted to 20,250 pounds gross weight.
NOTE 9: S-70C derivatives of UH -60L aircraft may be operated at gross weights up to 23,500
pounds during external load operations, and hook loads up to 9,000 pounds in accordance
with U.S. Army aviation Safety Message 051326Z Jul 94, or appropriately revised FAA
approved Operator's Manual. U.S. Army Safety Message 051326Z Jul 94, Serial Number
91-26354 is Sikorsky Serial Number 701656 and Serial Number 91-26421 is Sikorsky
Serial Number 701771.
NOTE 10. The following table lists equivalent sets of technical data approved for proper
maintenance of the aircraft:
U.S. Army Manuals
Old New
S-70 Commercial Manuals
TM 55-1520-237-10 TM 1-1520-237-10 FAA Approved RFM
TM55-1520-237-MTF TM 1-1520-237-MTF Not Applicable
TM 55-1520-237-CL TM 1-1520-237-CL Not Applicable
TM 55-1520-237-PMS-1 TM 1-1520-237-PMS-1 TM 1-70-PMS-1
TM 55-1520-237-PMS-2 TM 1-1520-237-PMS-2 TM 1-70-PMS-2
TM 55-1520-237-23 TM 1-1520-237-23 TM 1-70-23 and
TM 1-70-23AW -2
TM 55-1520-237-T TM 1-1520-237-T TM 1-70-T
TM 55-1520-237-23P TM 1-1520-237-23P TM 1-70-23P
TM 11-1520-237-23 TM 11-1520-237-23 TM 11-70-23
TM 11-1520-237-23P TM 11-1520-237-23P TM 11-70-23P
TM 55-2840-248-23 & P TM 1-2840-248-238P Not Applicable
The initial publication date of the U.S. Army TM 1 series was 31 August 1994.
The initial publication date of the Sikorsky TM-1 series was 31 August 1994.
NOTE 11. The CT7-2C is no longer an active engine model.
NOTE 12: For aircraft equipped with optional engines: (UH -60L derivative only)
ENGINES: 2 General Electric T700-GE-701D/CC
FUEL: Aviation Kerosene JP-4, JP-5, JP-8, Jet A, Jet A1, or Jet B
ENGINE LIMITS
SHAFT HP
(S.L. STD.)
POWER TURBINE
RPM/%
GAS. GEN.
RPM/%
TURBINE GAS
TEMP. oC
Contingency Rated 1,940 20,900/100 44,700 /102 903
Power (CRP)
2 1/2 min. OEI)
Maximum Rating 1,890 20,900/100 44,700/102 878
(10 min. dual
Intermediate Rated 1,800 20,900/100 44,700/102 851
Power
(IRP) (30 min. dual)
Maximum Continuous 1,662 20,900/100 44,700/102 810
Power (MCP
TRANSMISSION LIMITS: TORQUE
135% Single Engine (No time limits)
120% Dual Engine (No time limits)
Other Operating Limitations U.S. Army TM 1-1520-237-10, UH-60A, UH-60L, EH-60A Operator's
Manual, dated August 31, 1994, as revised, and Sikorsky Supplements C-4 and C-5, dated October
26, 1990, as revised. For aircraft Serial Numbers 701825 and 701835, TM 55-1520-237-10HK, dated
October 29, 1992, as revised, is applicable.
Equipment: Each type certificated helicopter with T700-GE-701D/CC engines installed must be
equipped with U.S. Army TM-1-1520-237-10, UH-60A, UH-60L, EH-60A Operator's Manual, dated
August 31,1994, as revised, and Sikorsky supplements No. C-4 and C-5, dated October 26, 1990, as
revised. For aircraft serial numbers 701825 and 701835, TM 55-1520-237-10HK Operator's Manual
dated October 29, 1992, as revised, is applicable.
Removal and replacement of equipment is in accordance with Sikorsky Aircraft Kit Drawing No. 70010-
00003 (Dash number as applicable).
Information essential to the proper maintenance of the aircraft is contained in the following U.S. Army
publications, as revised: TM 11-1520-237-23-1, -2, and -3, dated June 10, 1989; TM 55-1520-237-23,
Volumes 1 through 8, dated August 29, 1989; TM 55-1520-237T, dated August 29, 1989; TM 55-1520-
237-PMS-1, dated June 30, 1990; TM 55-1520-237-PMS-2, dated August 30, 1990; TM 55-1520-237-
CL, dated June 10, 1989; TM 55-1520-237-MTF, dated November 13, 1990; and Sikorsky supplement
C-7 to these publications. Information essential to the proper maintenance of the T700-GE-701D/CC
engines is contained in U.S. Army TM 1-2840-248-23&P, as revised and General Electric Publication
SEI-671, as revised. Component overhaul and replacement times shall be in accordance with U.S.
Army TM 55-1520-237-23, Volume 1, Chapter 1, Table I-II, dated August 29, 1989, as revised, and
Sikorsky supplement C-7 to this publication, unless superseded by appropriate airworthiness directive.
Alternate information essential to the proper maintenance of the aircraft is contained in the following U.S.
Army publications, as revised: TM 11-1520-237-23-1, -2, and -3, dated April 30, 1979; TM 55-1520-23723-
1, dated December 8, 1987; TM 55-1520-237-23-2 through -10, dated December 29, 1978; TM 55-1520-
237-PMS-1, dated July 14, 1988; TM 55-1520-237-PMS-2, dated April 12, 1988; TM 55-1520-237-CL,
dated August 15, 1987; TM 55-1520-237-MTF, dated January 8, 1988; and Sikorsky Supplement C-1 to
these publications. Information essential to the proper maintenance of the T700-GE-701D/CC engines is
contained in U.S. Army TM 1-2840-248-23&P, dated December 31, 1981; as revised and General Electric
Publication SEI-671, as revised. Component overhaul and replacement times shall be in accordance with
U.S. Army TM 55-1520-237-23-2, dated December 29, 1978; and Sikorsky Supplement C-1 to this
publication, unless superseded by appropriate Airworthiness Directive.
The U.S. Army replaced TM 55-1520-237-23-1 through -10 with a single manual, TM 55-1520-237-23,
composed of 18 chapters and 8 appendices divided into 8 volumes. Either set of TM's may be used.
(See NOTE 10)
Information on civil aircraft serial number correlation to U.S. Army serial numbers is contained in
Sikorsky Letter TPL-W91-450, dated July 23, 1991, as revised or Sikorsky Engineering Report SER-
51010189 dated 7 June 2016, as revised.
NOTE 13: For aircraft equipped with optional engines: (UH -60A derivative only)
ENGINES: 2 General Electric T700-GE-701D/CC
FUEL: Aviation Kerosene JP-4, JP-5, JP-8, Jet A, Jet A1, or Jet B
ENGINE LIMITS
SHAFT HP
(S.L. STD.)
POWER TURBINE
RPM/%
GAS. GEN.
RPM/%
TURBINE GAS
TEMP. oC
Contingency Rated 1,940 20,900/100 44,700 /102 903
Power (CRP)
2 1/2 min. OEI)
Maximum Rating 1,890 20,900/100 44,700/102 878
(10 min. dual
Intermediate Rated 1,800 20,900/100 44,700/102 851
Power
(IRP) (30 min. dual)
Maximum Continuous 1,662 20,900/100 44,700/102 810
Power (MCP
TRANSMISSION LIMITS: TORQUE
135% Single Engine (No time limits)
120% Dual Engine (No time limits)
EQUIPMENT: Removal and replacement of equipment in accordance with Sikorsky Aircraft
Drawings as listed below:
70351-48100 or 70351-58100 (Main Gearbox)
70070-55238-014 INSTRUMENT PANEL
70000-30100-043 HARDWARE SET
70070-30258-013 MOD KIT
70070-60220-014 KIT ENG HARNESS
70070-30258-015 MOD KIT
70070-30258-025 TUBE INSTL
70070-60220-013 CONVERTER
70070-60220-016 OVERHEAD CONSOLE
70070-60485-012 AVIONICS
70550-01126-075 AVIONICS
70550-01126-076 AVIONICS
70070-40037-015 FLIGHT CONTROLS KIT
70070-40037-016 FLIGHT CONTROLS KIT
70070-40039-011 MIXER ASSY KIT.
70070-30258 ENGINE INSTALL
Other Operating Limitations: U.S. Army TM 1-1520-237-10, UH-60A, UH-60L, EH-60A Operator's
Manual, dated August 31, 1994, as revised, and Sikorsky Supplements C-4 and C-5, dated October
26, 1990, as revised. For aircraft Serial Numbers 701825 and 701835, TM 55-1520-237-10HK, dated
October 29, 1992, as revised, is applicable.
Equipment: Each type certificated helicopter with T700-GE-701D/CC engines installed must be
equipped with U.S. Army TM-1-1520-237-10, UH-60A, UH-60L, EH-60A Operator's Manual, dated
August 31,1994, as revised, and Sikorsky supplements No. C-4 and C-5, dated October 26, 1990, as
revised. For aircraft serial numbers 701825 and 701835, TM 55-1520-237-10HK Operator's Manual
dated October 29, 1992, as revised, is applicable.
Removal and replacement of equipment is in accordance with Sikorsky Aircraft Kit Drawing No. 70010-
00003 (Dash number as applicable).
Information essential to the proper maintenance of the aircraft is contained in the following U.S. Army
publications, as revised: TM 11-1520-237-23-1, -2, and -3, dated June 10, 1989; TM 55-1520-237-23,
Volumes 1 through 8, dated August 29, 1989; TM 55-1520-237T, dated August 29, 1989; TM 55-1520-
237-PMS-1, dated June 30, 1990; TM 55-1520-237-PMS-2, dated August 30, 1990; TM 55-1520-237-CL,
dated June 10, 1989; TM 55-1520-237-MTF, dated November 13, 1990; and Sikorsky supplement C-7 to
these publications. Information essential to the proper maintenance of the T700-GE-701D/CC engines is
contained in U.S. Army TM 55-2840-248-23, dated December 31, 1981, as revised and General Electric
Publication SEI-671, as revised. Component overhaul and replacement times shall be in accordance with
U.S. Army TM 55-1520-237-23, Volume 1, Chapter 1, Table I-II, dated August 29, 1989, as revised, and
Sikorsky supplement C-7 to this publication, unless superseded by appropriate airworthiness directive.
(See NOTE 10)
Alternate information essential to the proper maintenance of the aircraft is contained in the following U.S.
Army publications, as revised: TM 11-1520-237-23-1, -2, and -3, dated April 30, 1979; TM 55-1520-23723-
1, dated December 8, 1987; TM 55-1520-237-23-2 through -10, dated December 29, 1978; TM 55-1520-
237-PMS-1, dated July 14, 1988; TM 55-1520-237-PMS-2, dated April 12, 1988; TM 55-1520-237-CL,
dated August 15, 1987; TM 55-1520-237-MTF, dated January 8, 1988; and Sikorsky Supplement C-1 to
these publications. Information essential to the proper maintenance of the T700-GE-701D/CC engines is
contained in U.S. Army TM 55-2840-248-23, dated December 31, 1981; as revised and General Electric
Publication SEI-671, as revised. Component overhaul and replacement times shall be in accordance with
U.S. Army TM 55-1520-237-23-2, dated December 29, 1978; and Sikorsky Supplement C-1 to this
publication, unless superseded by appropriate Airworthiness Directive. (See NOTE 10).
The U.S. Army replaced TM 55-1520-237-23-1 through -10 with a single manual, TM 55-1520-237-23,
composed of 18 chapters and 8 appendices divided into 8 volumes. Either set of TM's may be used.
(See NOTE 10)
Information on civil aircraft serial number correlation to U.S. Army serial numbers is contained in
Sikorsky Letter TPL-W91-450, dated July 23, 1991, as revised or Sikorsky Engineering Report SER-
51010189 dated 7 June 2016, as revised.
.
END