U.S. Department

of Transportation

Advisory

Circular

Federal Aviation

Administration

Subject:

NOISE LEVELS FOR AIRCRAFT USED 

FOR COMMERCIAL OPERATIONS IN 

GRAND CANYON NATIONAL PARK 

SPECIAL FLIGHT RULES AREA

Date: 6/13/2006

Initiated by: AEE-100

AC No: AC-93-2

Change:

1. Purpose. This circular contains the measured or estimated noise levels for aircraft currently used 

for commercial sightseeing operations in the Grand Canyon National Park (GCNP) special flight rules 

area, ranked in alphabetical order for the conditions and assumptions described below. This 

information is provided both for aircraft that have been noise type certificated under 14 CFR part 36, 

and for aircraft for which no such requirements existed at the time of type certification. The noise level 

data presented in the appendices are provided for determining the GCNP quiet aircraft technology 

designation status for each aircraft subject to 14 CFR part 93. 

2. Cancellation.

3. Background. On March 29, 2005, the Federal Aviation Administration (FAA) published a Final

Rule entitled “Noise Limitations for Aircraft Operations in the Vicinity of Grand Canyon National 

Park”. This amendment of 14 CFR part 93 is necessary to establish reasonably achievable 

requirements for aircraft operating in the GCNP to be considered as employing quiet aircraft 

technology. The standards for the GCNP quiet aircraft technology proposed in the rule will be used to 

assist the National Park Service (NPS) achieve its statutory mandate to provide for the substantial 

restoration of natural quiet and to enhance visitor’ experience in the GCNP.

4. Aircraft Noise Limits for GCNP Quiet Aircraft Technology. Noise levels of propeller-driven 

small airplanes and helicopters that operate at GCNP at the time of preparation of this circular are 

presented in Appendices 1 and 2. The data were obtained by the methodology described in Section 5 

of this circular. The sources of the data as they relate to Section 5 of this circular are designated in the 

“NOTES” column. The GCNP quiet aircraft technology status of each aircraft is provided in the 

“QUIET TECHNOLOGY” column.

Appendix 1 provides noise levels of propeller driven small airplanes that are subject to

Appendix F or G of 14 CFR part 36. Appendix 1 includes maximum takeoff weights, landing 

weights, engine type, horsepower, propeller type and diameter. 
AC-93-2 6/13/2006

Page 2

Appendix 2 contains noise levels of helicopters that are subject to Appendix H or J of 14 CFR 

part 36. This appendix includes maximum takeoff weights, landing weights, engine type, rotor 

type and diameter.

Aircraft are listed in alphabetical order by make and model in Appendices 1 and 2. The noise levels in 

the appendices were obtained during the noise certification process as prescribed under 14 CFR part 

36. Where no certificated noise level is available, the Administrator may approve an alternative

measurement or estimation procedure.

Part 93 classifies aircraft used in commercial sightseeing flight operations over GCNP by the noise 

they produce. Part 93 establishes the GCNP quiet aircraft technology designation status for propellerdriven small airplanes and helicopters. The status of each aircraft was determined according to its 

noise nuisance at a common noise sensitive reference point in GCNP. The aircraft noise limits, based 

on aircraft certification noise levels are shown in Figure 1 through 4 for GCNP quiet aircraft 

technology. 

The noise limits are expressed for propeller-driven small airplanes and helicopters as follows:

 (a) For helicopters with a flyover noise level obtained in accordance with the measurement 

procedures prescribed in Appendix H of part 36, the limit is 80 dB for helicopters having 2 or fewer 

passenger seats, increasing at 3 decibels per doubling of the number of passenger seats for helicopters 

having 3 or more passenger seats. The limit for helicopters having 3 or more seats can be calculated 

using the formula:

EPNL(H) = 80 +10log(# PAX seats/2) dB

(b) For helicopters with a flyover noise level obtained in accordance with the measurement 

procedures prescribed in Appendix J of part 36, the limit is 77 dB for helicopters having 2 or fewer 

passenger seats, increasing at 3 decibels per doubling of the number of passenger seats for helicopters 

having 3 or more passenger seats. The limit for helicopters having 3 or more seats can be calculated 

using the formula:

SEL(J) = 77 +10log(# PAX seats/2) dB

(c) For propeller-driven airplanes with a measured flyover noise level obtained in accordance 

with the measurement procedures prescribed in Appendix F of part 36 without the performance 

correction defined in Sec. F35.201(c), the limit is 69 dB for airplanes having 2 or fewer passenger 

seats, increasing at 3 decibels per doubling of the number of passenger seats for airplanes having 3 or 

more passenger seats. The noise limit for propeller-driven airplanes having 3 or more seats can be 

calculated using the formula:

LAmax(F) = 69 +10log(# PAX seats/2) dB

(d) In the event that a flyover noise level is not available in accordance with Appendix F of 14 

CFR part 36, the noise limit for propeller-driven airplanes with a takeoff noise level obtained in 

accordance with the measurement procedures prescribed in Appendix G is 74 dB or 77 dB depending 

on 14 CFR part 36 amendment level, for airplanes having two or fewer passenger seats, increasing at 3 

dB per doubling of the number of passenger seats for airplanes having three or more passenger seats.

The noise limit for propeller driven airplanes having 3 or more seats can be calculated using the 

formula:
6/13/06 AC-93-2

Page 3

LAmax(G) = 74 +10log(# PAX seats/2) dB 

for aircraft certificated to 14 CFR part 36 Amendment 21 or earlier;

LAmax(G) = 77+10log(# PAX seats/2) dB 

for aircraft certificated to 14 CFR part 36 Amendment 22 or later.

5. Methodology to Categorize Noise Efficiency. The GCNP noise incentive plan is based on 

certificated noise levels determined under 14 CFR part 36. These levels may be found in FAA AC 36-

1H or in the aircraft flight manual. Some aircraft, depending on the date of type certification, were not 

subject to the noise certification provisions of 14 CFR part 36, and do not have noise certification 

levels. For those aircraft, either measured noise levels from tests that are not approved by the FAA as 

certification quality (e.g., research test data) or estimates by approved methods were used. All 

estimated noise certification levels provided in this circular are for the sole and specific purpose of 

determining compliance with GCNP noise efficiency criteria and may not be used to establish 

compliance under any regulation.

The following hierarchy of noise level data sources was used in establishing noise levels for aircraft 

listed in Appendices 1 and 2. The same hierarchy will be used for future additions to the appendices. 

1. U.S. type certifications using 14 CFR part 36 with noise certification levels obtained from 

FAA-approved flight manuals or FAA AC 36-1.

a) For propeller driven small airplanes the hierarchy of regulations is:

1) 14 CFR part 36 Appendix F

2) 14 CFR part 36 Appendix G

b) For helicopters the hierarchy of regulations is:

3) 14 CFR part 36 Appendix J

4) 14 CFR part 36 Appendix H

2. Foreign type certifications using ICAO Annex 16, Volume I with noise certification levels 

obtained from approved flight manuals, data approved by the foreign civil aviation authority, 

or FAA AC 36-1.

a) For propeller driven small airplanes the applicable hierarchy of regulations is:

1) ICAO Annex 16, Volume I Chapter 6

2) ICAO Annex 16, Volume I Chapter 10

b) For helicopters the hierarchy of regulations is:

3) ICAO Annex 16, Volume I Chapter 11

4) ICAO Annex 16, Volume I Chapter 8

3. Research or other measurement test data obtained under controlled conditions, documented and 

corrected to the certification conditions of part 36 Appendix F for small propeller driven 

airplanes and part 36 Appendix J for helicopters. Preference would be placed on those data 

obtained under certification-like conditions or those data collected under an FAA-sponsored 

noise research test.

4. FAA approved noise estimation methods that seek to estimate part 36 Appendix F noise levels 

for small propeller driven airplanes or part 36 Appendix J noise levels for helicopters. 

Currently the following methods may be suitable for use, but are subject to FAA approval on a 

case-by-case basis.
AC-93-2 6/13/2006

Page 4

a) For propeller driven small airplanes: Method in Section 2.2 of DOT/FAA/AEE-82-

11

b) For helicopters: SAE/AIR 19892

5. FAA approved noise level estimation method using FAA's Integrated Noise Model (INM) or an 

FAA-approved equivalent.

As one moves down in the hierarchy, the expected level of substantiation (as the representative 

noise certification level-estimated) by the operator or owner increases, and the level of FAA 

scrutiny will increase.

The resulting noise levels will vary depending upon the availability of FAA-approved data and its rank 

in the hierarchy. In the case of helicopters, the noise levels must be the flyover noise certification level

and expressed in the noise metric of Effective Perceived Noise Level (14 CFR part 36, Appendix H) or 

Sound Exposure Level (14 CFR part 36, Appendix J). In the case of small propeller-driven airplanes 

the noise levels must be the flyover (14 CFR part 36, Appendix F) or takeoff (14 CFR part 36, 

Appendix G) noise certification level and expressed in the noise metric of maximum A-weighted sound 

level.

6. Distribution.

7. Revisions.

Carl E. Burleson

Director of Environment and Energy

 

1

 DOT/FAA/AEE-82-1: “A Description of Methodologies Used in Estimation of A-Weighted Sound Levels for FAA 

Advisory Circular AC-36-3B”, published by AEE in January 1982

2 SAE/AIR 1989: “Helicopter External Noise Estimation “, published by Society of Automotive Engineering in December 

1992.
6/13/06 AC-93-2

Page 5

LIST OF FIGURES
AC-93-2 6/13/2006

Page 6

Figure 1

GCNP Aircaft Noise Limits for Quiet Technology

Helicopters Measured Under Appendix H

75

80

85

90

95

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Number of Pasenger Seats

Effe

ctiv

e

P

erc

eiv

e

d

N

ois

e

L

e

v

el (E

P

N

d

B)

EPNL(H) = 80 +10log(# PAX seats/2) dB
6/13/06 AC-93-2

Page 7

Figure 2

GCNP Aircaft Noise Limits for Quiet Technology

Helicopters Measured Under Appendix J

75

80

85

90

95

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Number of Pasenger Seats

S

o

u

n

d

E

x

p

o

s

ure

L

e

v

el (d

B)

SEL(J) = 77 +10log(# PAX seats/2) dB
AC-93-2 6/13/2006

Page 8

Figure 3

GCNP Aircaft Noise Limits for Quiet Technology

Propeller-Driven Small Airplanes Measured

 Under Appendix F

65

70

75

80

85

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Number of Pasenger Seats 

A-W

eig

hte

d

S

o

u

n

d

Pre

s

s

ure

L

e

v

el

(d

B

A)

Lamax(F) = 69 +10log(# PAX seats/2) dB
6/13/06 AC-93-2

Page 9

Figure 4

GCNP Aircaft Noise Limits for Quiet Technology

Propeller-Driven Small Airplanes Measured Under Appendix G

70

75

80

85

90

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Number of Pasenger Seats 

A-W

eig

hte

d

S

o

u

n

d

Pre

s

s

ure

L

e

v

el (d

B

A)

Lamax(G) = 74 +10log(# PAX seats/2) dB 

for certifications obtained under 14 CFR 

part 36 Amendment 21 or earlier

Lamax(G) = 77 +10log(# PAX seats/2) dB 

for certifications obtained under 14 CFR 

part 36 Amendment 22 or later
AC-93-2 6/13/2006

Page 10

APPENDICES
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

EXHAUST

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

APP. F (dBA)

APP. G (dBA)

# OF PAX

NOTES

BEECH

 36, A36

3.6

3.6

1

TCM

I0-520-B(A)

285

2700

5

3

MCCAULEY

3A32C76

80

2700 V78.85F NO

BEECH

36, A36

3.6

3.6

1

TCM

I0-520-BB

275

2550

5

2

MCCAULEY

2A36C23

84

2550 V78.05F NO

BEECH

36, A36

3.65

3.7

1

TCM

IO-550-B

300

2700

5

3

MCCAULEY

3A32C406

80

2700 V78.25F NO

BEECH

65A90

9.3

8.8

2

P&W

PT6A-20

500

2200

9

3

HARTZELL

HC-B3TN-2B/M

93

2200 V78.78F NO

BEECH

76

3.9

3.9

2

LYC

O-360-A1G6D

165

2700

2

2

HARTZELL

HC-M2YR-2CEUF

76

2700 V80.25F NO

BEECH

76

3.98

3.98

2

LYC

O-360-A1G6D

165

2700

5

2

HARTZELL

HC-M2YR-2CLUF

76

2700 V79.55F NO

BEECH

C99

11.3

11.3

2

P&W

PT6A-36

715

2200

9

3

HARTZELL

HC-B3TN-3B/M

93

2200 V79.3 15F NO

BEECH

V35

3.4

3.4

1

TCM

I0-520-BA

285

2700

5

3

MCCAULEY

3A32C406

78

2700 V78.14F NO

CESSNA

172M

2.3

2.3

1

LYC

0-320-E2D

150

2700

6

2

MCCAULEY

1C160/CTM/DTM

75

2700 F74.33F NO

CESSNA

172P

2.4

2.4

1

LYC

0-320-D2J

150

2700

6

2

MCCAULEY

1C160/DTM

75

2700 F74.33F NOQUIET TECHNOLOGY
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

EXHAUST

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

APP. F (dBA)

APP. G (dBA)

# OF PAX

NOTES

QUIET TECHNOLOGY

CESSNA

182*

2.55

2.55

1

TCM

0-470-L

230

2600

5

2

HARTZELL

HC-82XF-1

82

2600 V72.03F NO

CESSNA

182H*

2.8

2.8

1

TCM

0-470-R

230

2600

5

2

MCCAULEY

2A34C66

82

2600 V72.03F NO

CESSNA

182P

2.95

2.95

1

LYC

0-470-R/S

230

2600

5

2

MCCAULEY

2A34C-201/66

82

2600 V72.03F NO

CESSNA

182R 3.1

1

TCM

0-470-V

230

2600

5

2

MCCAULEY

C2A34C204

82

2400 V72.03F NO

CESSNA

182Q

2.95

2.95

1

LYC

0-470-U

230

2400

5

2

MCCAULEY

C2A34C204

82

2400 V72.03F NO

CESSNA

206*

3.3

3.3

1

TCM

IO-520-A

285

2700

5

2

MCCAULEY

D2A34C58

82

2700 V78.55F NO

CESSNA

207*

3.8

3.8

1

TCM

IO-520-F

285

2700

5

3

MCCAULEY

D3A32C90

80

2700 V77.86F NO

CESSNA

207A*

3.8

3.8

1

TCM

IO-520-F

285

2700

5

3

MCCAULEY

D3A34C404

80

2700 V79.06F NO

CESSNA

208 (AMPHIB)*

7.6

7.3

1

P&W

PT6A-114

600

9

3

HARTZELL

HC-B3MN-3

100

1900 V72.89F YES

CESSNA

208 (LAND)*

8

7.8

1

P&W

PT6A-114

600

9

3

HARTZELL

HC-B3MN-3

100

1900 V72.89F YES
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

EXHAUST

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

APP. F (dBA)

APP. G (dBA)

# OF PAX

NOTES

QUIET TECHNOLOGY

CESSNA

208B*

8.75

8.5

1

PRATT+WHITNEY

PT6A-114

600

8

3

HARTZELLL

HC-B3MN-3

100

1900 V72.8 13F YES

CESSNA

402 / 402B*

6.3

6.2

2

TCM

TSIO-520-E/B

300

2700

4

3

MCCAULEY

3AF32C504

76.5

2700 V81.68F NO

CESSNA

402A*

6.3

6.2

2

TCM

TSIO-520E

300

2700

4

3

MCCAULEY

3AF32C87NR

76.5

2700 V81.68F NO

CESSNA

402C*

6.85

6.9

2

TCM

TSIO-520-UB

325

2700

4

3

MCCAULEY

3AF32C92N

76

2700 V80.89F NO

CESSNA

402C*

6.85

6.9

2

TCM

TSIO-520-VB

310

2600

4

3

MCCAULEY

3AF32C93

77

2600 V77.29F NO

CESSNA

421C

7.2

7.45

2

TCM

GTSIO-520-L/N

375

2235

4

3

MCCAULEY

3FF32C501

90

2235 V80.39F NO

CESSNA

425

8.2

8.0

2

P&W

PT6A-112

500

9

3

HARTZELL

HC-B3TN-3D

102

2110 V75.7 19F YES

CESSNA

CE-182R*

3.10

1

TCM

O-470-V

230

2400

8

2

MCCAULEY

D2A34C203

82

2400 V72.03F NO

CESSNA

CE-182-R182*

3.10

3.10

1

TCM

O-540-J3C5D

235

2400

8

2

MCCAULEY

B3D34C214

82

2400 V72.73F NO

CESSNA

CE-402-B*

6.85

6.85

2

TCM

TSIO-520-E 

150

2700

3

3

MCCAULEY

3AF32C87M

76

2700 V81.69F NO
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

E

X

H

A

U

S

T

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

A

P

P. F (dB

A)

A

P

P. G (dB

A)

#

OF P

A

X

N

O

T

E

S

Q

UIE

T

T

E

C

H

N

OLO

G

Y

CESSNA

T207*

3.8

3.8

1

TCM

TSIO-520-G

285

2600 4

3

MCCAULEY

D3A32C90

80

2600

V

77.9 6 F NO

CESSNA

T207A*

3.8

3.8

1

TCM

TSIO-520-G-1A

285

2600 4

3

MCCAULEY

3A32C401

80

2600

V

77.9 6 F NO

CESSNA

T210L

3.8

3.8

1

TCM

IO-520-L

285

2700 5

3

MCCAULEY

D3A34C402-C

80

2700

V

80.2 5 F NO

CESSNA

T210M*

3.8

3.8

1

TCM

IO-520-L

285

2700 5

3

MCCAULEY

D3A32C88

80

2700

V

77.4 5 F NO

CESSNA

T210N

3.8

3.8

1

TCM

IO-520-L

285

2700 5

3

MCCAULEY

D3A34C404

80

2700

V

77.4 5 F NO

CESSNA

TR182

3.1

3.1

1

LYC

O-540-L3C5D

235

2400 5

2

MCCAULEY

B2D34C217

82

2400

V

73.8 3 F NO

CESSNA

TR182

3.1

3.1

1

LYC

O-540-L3C5D

235

2400 5

3

MCCAULEY

B3D32C407

79

2400

V

70.6 3 F YES

CESSNA

TU206C / TU206F*

3.6

3.6

1

TCM

TSIO-520-C

285

2700 4

3

MCCAULEY

D2A34C78

82

2700

V

78.5 5 F NO

CESSNA

TU206G*

3.6

3.6

1

TCM

TSIO-520-M

285

2600 4

3

MCCAULEY

D3A34C402

80

2600

V

78.5 5 F NO

CESSNA

TU206G (AMPHIB)*

3.6

3.6

1

TCM

TSIO-520-M

285

2600 4

3

MCCAULEY

D3A34C402

80

2600

V

78.0 5 F NO
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

EXHAUST

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

APP. F (dBA)

APP. G (dBA)

# OF PAX

NOTES

QUIET TECHNOLOGY

CESSNA

U206B/D/F*

3.6

3.6

1

TCM

IO-520-F

285

2700

5

3

MCCAULEY

D2A34C58

82

2700 V77.95F NO

CESSNA

U206B/D/F/G*

3.6

3.6

1

TCM

IO-520-F

285

2700

5

3

HARTZELL

HC-C3YF-IRF

78

2700 V77.95F NO

DE HAVILLAND

DHC-6-300*

12.5

12.3

2

P&W

PT6A-27

680

9

3

HARTZELL

HC-B3TN-3D

102

2110 V77.2 196 YES

DORNIER

DO-228-202*

13.15

2

ALLIED SIGNAL

TPE-331-5-252D

455

3810

1

4

HARTZELL

HC-B4TN-5ML

107V

78.346 NO

DORNIER

DO-228-202*

13.15

2

ALLIED SIGNAL

TPE-331-5-252D

455

3810

1

4

HARTZELL

HC-B4TN-5ML

107V

78.3 196 YES

FOKKER

F27

45.0

42.0

2

ROLLS ROYCE

DART 532-7R

2307

8

2?

DOWTY ROTOL

R193-4-30-4

138V

85.0 42I YES

PARTENAVIA

68CTC

4.38

4.38

2

LYC

TIO/T0-360-C1A6D

210

2575

4

2

HARTZELL

HC-C2YK-2CUF

76

2575 V75.46F NO

PIPER 

PA-18-150

17.5

17.5

1

LYC

O-320-A2B

150

2700

7

2

SENSENICH

M74DM6-0-56

74

2700 F69.03F YES

PIPER

28-R200

2.65

2.65

2

TCM

TSI0-360-E/EB

200

2700

5

2

HARTZELL

HC-C2YK-1( )/F

74

2700 V75.53F NO

PIPER

32-300

3.4

3.4

1

LYC

I0-540-K1A/G5

300

2700

5

2

HARTZELL

HC-C2YK-1( )/F

80

2700 V80.56F NO
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

E

X

H

A

U

S

T

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

A

P

P. F (dB

A)

A

P

P. G (dB

A)

#

OF P

A

X

N

O

T

E

S

Q

UIE

T

T

E

C

H

N

OLO

G

Y

PIPER

32RT-300T

3.6

3.6

1

LYC

TI0-540-S1AD

270

2575 4

2

HARTZELL

HCE2YR-1( )/F

80

2575

V

75.7 6 F NO

PIPER

PA-31-350

7.01

7

2

LYC

TIO-540-J2BD

315

2400 4

3

HARTZELL

HC-E3YR-2ATF 

80

2400

V

78.0 9 F NO

PIPER

PA-31-T3

9.0 2

PWC

PT6A-11

455

3810 1

3

HARTZELL

HC-B3TN-3B/T

93

V

76.6 3 F NO

PIPER

PA-34-200T

4.57

4.34

2

TCM

TSI0-360-E/EB

200

2575 4

2

HARTZELL

BHC-C2YF-2( )F/UF

76

2575

V

75.7 5 F NO

PIPER

PA-34-200T

4.57

4.34

1

LYC

I0-360-C1C/6

200

2575 5

3

MCCAULEY

3AF34C502/3

76

2575

V

78.6 5 F NO

PIPER

PA-42-720

11.2

10.23

2

PRATT+WHITNEY

PT6A-41

720 8

3

HARTZELLL

HC-B3TN-3B/T10173AB-6Q

95

2000

V

80.3 8 F NO

EXHAUST CONFIGURATIONS (RECIPROCATING ENGINES) STUB PIPES

1 = SMALL COLLECTOR, SHORT EXHAUST PIPE

2 = BAFFLES IN COLLECTOR AND/OR CONES IN EXHAUST PIPE

3 = TURBOCHARGER

4 = HEAT MUFF

5 = COLLECTOR WRAPAROUND MANIFOLD STRAIGHT PIPE

6 = MANIFOLD MUFFLER

7 = RESONATOR MUFFLER

8 = TURBINE

* currently flying at GCNP
APPENDIX I

GCNP INCENTIVE PLAN NOISE LEVELS

PROPELLER-DRIVEN SMALL AIRPLANES

Updated 12/22/2008

 NOISE

 LEVEL

MAKE

MODEL

MTOW

MLW

# OF ENGINES

MAKE

MODEL

ENG.

PWR

RPM

E

X

H

A

U

S

T

# OF PROP BLADES

MAKE

MODEL

PROP

DIA

RPM

PITCH

A

P

P. F (dB

A)

A

P

P. G (dB

A)

#

OF P

A

X

N

O

T

E

S

Q

UIE

T

T

E

C

H

N

OLO

G

Y

NOTES COLUMN INDICATE THE HIERARCHY USED IN OBTAINING THE NOISE LEVEL

FOR THE EXPLANATION OF THE HIERARCHY SEE SECTION 6.

F = 14 CFR part 36 Appendix F measured noise levels

G = 14 CFR part 36 Appendix G certificated noise level

6 = ICAO Annex 16, Volume I Chapter 6 measured noise levels

10 = ICAO Annex 16, Volume I Chapter 10 certificated noise level

R = Research or other measurement test data

E = FAA approved noise estimation method defined by fourth hierarcy in Section 5

I = FAA approved noise estimation using the Integrated Noise Model

FOR DEFINITION OF CATEGORIES SEE SECTION 4 AND FIGURE 1.

NOMENCLATURE # Number

APP. F (dBA) Measured/Estimated APP. F level in dBA by the method described in 

column labeled NOTES 

APP. G (dBA) Measured/Estimated APP. G level in dBA by the method described in 

column labeled NOTES 

ENG, POWER, RPM Engine power in HP, operational RPM

MAKE, MODEL Manufacturer and model designation

MTOW, MLW Maximum Takeoff Weight, Maximum Landing Weight

PAX Passenger seats

PROP DIAM, RPM, PITCH Propeller diameter in inches, operational RPM AND PITCH 

(V: Variable, F: Fix)
APPENDIX II

GCNP INCENTIVE PLAN NOISE LEVELS

HELICOPTERS

Updated 12/22/2008

 NOISE

 LEVEL

HELICOPTER

MAKE 

MODEL

MGW 

MLW 

# OF ENGINES

MAKE MODEL

MAIN ROTOR

#OF BLADES

MAKE

MODEL

M

AIN

R

O

T

O

R

DIA.

TAIL ROTOR

#OF BLADES

MAKE

MODEL

T

AIL R

O

T

O

R

DIA

A

P

P. H (E

P

NdB)

A

P

P. J (S

EL)

#

OF P

AX

N

O

T

E

S

AEROSPATIALE 

AS-350-B ASTAR 4.63 1Turbomeca Arriel 1B

3 AEROSPATIALE/

EUROCOPTER 35' 2AERO/EURO 6'10" 86.8 6 H NO

AEROSPATIALE

AS-350-BA* 4.63 1Turbomeca Arriel 1B

3 AEROSPATIALE/

EUROCOPTER 35' 2AERO/EURO 6'10" 86.8 6 H NO

AEROSPATIALE

AS-350-B2 Ecureuil * 4.96 1Turbomeca Arriel 1D1

3 AEROSPATIALE/

EUROCOPTER 35' 2AERO/EURO 6'10" 87.1 6 H NO

AEROSPATIALE

AS-350-B2 Ecureuil * 4.96 1Honeywell LTS101-700D-2

3 AEROSPATIALE/

EUROCOPTER 35' 2AERO/EURO 6'10" 85.4 6 NO

AEROSPATIALE

AS-350-B3 Ecureuil 4.96 1 

Turbomeca Arriel 2B

3 AEROSPATIALE/

EUROCOPTER 35' 2AERO/EURO 6'10" 87.3 6 H/8 NO

AEROSPATIALE

AS-350-B3 Ecureuil 5.071 1 

Turbomeca Arriel 2B

3 AEROSPATIALE/

EUROCOPTER 35' 2AERO/EURO 6'10" 84.7 6 J/11 NO

BELL Jet Ranger

BHT-206-B/BII* 3.2 1Allison 250-C20

2

BHT-206 33' 4" 2BHT-206 5' 5" 84.6 4 8 NO

BELL - Long Ranger

BHT-206-L/ L1* 4.05 1Allison 250-C28B

2

BHT-206 37' 2BHT-206 5' 6" 85.8 6 8 NO

BELL - Long Ranger III

BHT-206-L3* 4.15 1Allison 250-C30P

2

BHT-206 37' 2BHT-206 5' 6" 87.8 6 8 NO

BELL - Long Ranger IV

BHT-206-L4* 4.45 1Allison 250-C30P

2

BHT-206 37' 2BHT-206 5' 6" 85.2 6 H NO

BELL - Long Ranger

BHT-206-L4* 4.55 1Allison 250-C20R

2

BHT-206 37' 2BHT-206 5' 6" 85.2 6 J NO

BELL

BHT-407* 5 1Allison 250-C47

4

BHT-407 35' 2BHT-407 5' 5" 85.1 6 J NO

BELL

BHT-407 with Quiet Cruise 

Kit*

5 1

Allison 250-C47

4

BHT-407 35' 2BHT-407 5' 5" 81.3 6 J YES

Q

UIE

T

T

E

C

H

N

OLO

G

Y
APPENDIX II

GCNP INCENTIVE PLAN NOISE LEVELS

HELICOPTERS

Updated 12/22/2008

EUROCOPTER 

EC-130-B4* 5.291 1Turbomeca Arriel 2 B 1

3 

EUROCOPTER 35' 10EUROCOPTER 3'3" 84 7 H/8 YES

EUROCOPTER 

EC-130-B4* 5.351 1Turbomeca Arriel 2 B 1

3 

EUROCOPTER 35' 10EUROCOPTER 3'3" 84 7 H/8 YES

 MDHI 

MD-900 Explorer* 6.25 1 PW206A 1C 5 MDHI 33.83' NOTAR System - 83 8 H YES

 MDHI 

MD-900 Explorer* 6.25 1 PW207E 5 MDHI 33.83' NOTAR System - 83 8 H YES

Whisper Jet S-55QT 

(Sikorsky S-55 modified)* 7.7 1 Allied Signal TSE 331-10-591 SW 5 S-55 53' 2S-55 8' 9" 80 9 H YES

FOR THE EXPLANATION OF THE HIERARCHY SEE SECTION 6.

H = 14 CFR part 36 Appendix H

J = 14 CFR part 36 Appendix J

8 = ICAO Annex 16, Volume I Chapter 8

11 = ICAO Annex 16, Volume I Chapter 11

R = Research or other measurement test data

E = FAA approved noise estimation method as defined in the fourth hieraracy in Section 5

I = FAA approved noise estimation using the Integrated Noise Model

FOR DEFINITION OF CATEGORIES SEE SECTION 4 AND FIGURE 1-4.

NOMENCLATURE

# Number

APP. H NOISE LEVEL Measured/Estimated App. H level in EPNdB by

method described in column labeled NOTES 

APP. J NOISE LEVEL Measured/Estimated App. J level in SEL by

method described in column labeled NOTES 

DIA Diameter in feet

MAKE, MODEL Manufacturer and model designation

MTOW, MLW (1000 LBS) Maximum Takeoff Weight, Maximum Landing Weight

PAX Passenger seats

* Currently flying at GCNP