- Holder
- Atlantic Coast Seaplanes LLC
- Revision
- 9
- Revised
- April 14, 2008
- Status
- Current
- Product
- Aircraft · Small Airplane
- Certification basis
- Part 21, Part 23, CAR 3
- Models
- 4
- Registered
- 4 aircraft
The release keeps the latest revision of each data sheet. Model names are as the data sheet lists them.
On this page
Models · 4
| Model | Also known as | Note |
|---|---|---|
| G-21E | Formerly McKinnon Enterprises, Inc., then AERO PLANES, LLC | |
| G-21D | Formerly McKinnon Enterprises, Inc., then AERO PLANES, LLC | |
| G-21C | Formerly McKinnon Enterprises, Inc., then AERO PLANES, LLC | |
| G-21G | Formerly McKinnon Enterprises, Inc., then AERO PLANES, LLC |
Airworthiness directives · 1
ADs whose products are models on this data sheet, matched by model and maker.
Registered aircraft
Registry models that point at this data sheet, with their registered aircraft.
STCs approved under this data sheet · 33
STC SA02571SEInstallation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).STC SA04837NYInstallation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lightsSTC SA02019SE-DInstallation of Garmin Model GTN 625/635/650; 725/750 Navigation System
See all 33 STCsWhat the data sheet says
From the PDF’s text layer, line by line: tables lose their columns. The PDF is the record.
Page No. 1 2 3 4 5 6 7 8 9
Rev. No. 8 7 7 7 7 7 7 7 7
DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
4A24
Revision 9
Atlantic Coast Seaplanes LLC
G-21C, G-21D
G-21E, G-21G
April 14, 2008
TYPE CERTIFICATE DATA SHEET NO.4A24
This data sheet which is a part of type certificate No. 4A 24 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 Holder A tlantic Coast Seaplanes LLC
3623 N. Elm Street, Suite 200
P. O. Box 41027
Greensboro, NC 27455
Type Certificate Holder Record: A.G. McKinnon transferred 4A24 to Viking Air Limited on June 6, 1984
Viking Air Limited transferred 4A24 to Aero Planes, Inc on September 4, 1998
TC 4A24 was reissued to Aero Planes, LLC on May 5, 2000
Aero Planes, LLC transferred 4A24 to Atlantic Coast Seaplanes LLC on
September 27, 2007.
TC 4A24 reissued to Atlantic Coast Seaplanes LLC on March 7, 2008.
I - Model G-21C (Normal Category) Approved 7 November 1958
Engines Four Lycoming GSO-480-B2D6
Fuel 100/130 minimum grade aviation gasoline
Engine limits (Straight line manifold pre ssure variation with altitudes as shown).
H.P. R.P.M. MP ALT.
Takeoff (5 minutes) 340 3400 48.0 S.L.
Takeoff (5 minutes) 340 3400 44.5 8000
Maximum continuous 320 3200 45.0 S.L.
Maximum continuous 320 3200 43.0 7500
Propeller and Four Hartzell constant sp eed propellers, hubs HC-83XF-3A, blades
propeller limits 9333CH-0. Diameter: Max. 93 in., min. allowable for repairs
91 in. No further reduction permitted.
Pitch settings at 30 in. station: Low 17.5°, feathered 85°, reverse -23°
Placard required:
"Avoid continuous operati on between 2800 and 3100 R.P.M."
Airspeed limits Vne Never exceed 264 m.p.h. (229 knots)
Vno Maximum structural cr uising 211 m.p.h. (183 knots)
Va Maneuvering 174 m.p.h. (151 knots)
Vfe Flaps extended 137 m.p.h. (119 knots)
Vlo Landing gear operation 211 m.p.h. (183 knots)
Vle Landing gear extended 211 m.p.h. (183 knots)
Vmc Minimum control 123 m.p.h. (107 knots)
C. G. range* (+22.0) (17.0% MAC) to (+29.6) (24.9% MAC)
(Landing gear extended) *NOTE: The main gear retracts parallel to the wing reference axis;
hence, this has no effect on airplane C.G.
Empty weight C.G. range None
Page 2 of 9 4A24
I - Model G-21C (cont'd)
Maximum weights Takeoff 12499 lb.
Landing (on land) 12000 lb.
Landing (on water) 12499 lb.
Maximum zero fuel weight 11500 lb.
Minimum crew One
No. of seats 9. (2 at -5, 2 at +24, 2 at +62, 1 at +118, 1 at +127, and 1 at +136)
Maximum baggage Fwd. compartment 300 lb. (-65)
Aft compartment 400 lb. (+169)
Fuel capacity See NOTE 1(b) for information relative to usable fuel.
Total Usable
2 main tanks 184 gal. ea. (+30) 183 gal. ea.
1 aux. tank 82 gal. (+30) 81 gal.
Total usable fuel 447 gal.
Oil capacity 24 gal. (6 gal. per engine) (+3)
Control surface movements Wing flaps Down 40°
Main surfaces Aileron Up 22° Down 17°
Elevator Up 26° Down 21°
Rudder Right 23° Left 17°
**Tabs Elevator Up 16-1/2° Down 22-1/2°
Rudder Right 17-1/2° Left 21°
**Set rudder tab 2-1/2° to the left, with indicator (in cockpit) set
on 0° or takeoff position. Left a nd right travel taken from this position.
Serial Nos. eligible 1202, 1204
II - Model G-21D (Normal Category) Approved 29 June 1960
The Model G-21D differs from the Model G-21C in that the bow has been lengthened 36 in. to accommodate increased passenger load ing
and the horizontal stabilizer and rudder tab have been increased in span for the increased controllability.
Engines Four Lycoming GSO-480-B2D6
Fuel 100/130 minimum grade aviation gasoline
Engine limits (Straight line manifold pre ssure variation with altitudes as shown).
H.P. R.P.M. MP ALT.
Takeoff (5 minutes) 340 3400 48.0 S.L.
Takeoff (5 minutes) 340 3400 44.5 8000
Maximum continuous 320 3200 45.0 S.L.
Maximum continuous 320 3200 43.0 7500
Propeller and Four Hartzell constant sp eed propellers, hubs HC-83XF-3A, blades
propeller limits 9333CH-0. Diameter: Max. 93 in., min. allowable for repairs
91 in. No further reduction permitted.
Pitch setting at 30 in. station: Low 17.5°, feathered 85°, reverse -23°
Placard required:
"Avoid continuous operati on between 2800 and 3100 R.P.M."
Page 3 of 9 4A24
II - Model G-21D (cont'd)
Airspeed limits Vne Never exceed 264 m.p.h. (229 knots)
Vno Maximum structural cr uising 211 m.p.h. (183 knots)
Va Maneuvering 174 m.p.h. (151 knots)
Vfe Flaps extended 137 m.p.h. (119 knots)
Vlo Landing gear operation 211 m.p.h. (183 knots)
Vle Landing gear extended 211 m.p.h. (183 knots)
Vmc Minimum control 123 m.p.h. (107 knots)
C. G. range* (+19.6) (14.5% MAC) to (+29.5) (24.8% MAC)
(Landing gear extended) *NOTE: The main gear retracts par allel to the wing reference axis;
hence, this has no effect on airplane C.G.
Empty weight C.G. range None
Maximum weights Takeoff 12499 lb.
Landing (on land) 12000 lb.
Landing (on water) 12499 lb.
Maximum zero fuel weight 11500 lb.
No. of seats 14, (2 at -100.5, 2 at -64.5, 2 at -5, 2 at +29, 2 at +91,
2 at +147.5, and 2 at +177)
Maximum baggage Fwd. compartment 300 lb. (-80)
Fuel capacity See NOTE 1(b) for in formation relative to unusable fuel.
Total Usable
2 main tanks 170 gal. ea. (+30) 168.5 gal. ea.
Total usable fuel 337 gal.
Oil capacity 24 gal. (6 gal. per engine) (+3)
Control surface movements Wing flaps Down 40°
Main surfaces Aileron Up 22° Down 17°
Elevator Up 26° Down 21°
Rudder Right 23° Left 17°
**Tabs Elevator Up 16-1/2° Down 22-1/2°
Rudder Right 17-1/2° Left 21°
**Set rudder tab 6° to the left, with indicator (in cockpit) set
on 0° or takeoff position. Left a nd right travel taken from this position.
Serial Nos. eligible 1251 through 1255
III - Model G-21E (Normal Category) Approved July 17, 1969
The Model G-21E is similar to the Model G- 21C except for the engine installation and re lated changes. A Model G-21C that has b een
modified in accordance with Supplemental Type Certificate No. SA1320WE is identical to the Model G-21E.
Engines 1. Two United Aircraft of Canada Lts. PT6A-20
Fuel JP-4 and JP-5 fuels conforming to Pr att & Whitney Aircraft Specification No. 522.
Oil Refer to UACL PT6 Engine Service Bulletin No. 1001 for eligible oils. (Not eligible
with MIL-L-7808 type oils.)
Page 4 of 9 4A24
III - Model G-21E (cont'd)
Engine ratings (Static Sea Level)
Shaft Jet Equivalent Propeller
Horse- Thrust Shaft Speed
power Lb. Horsepower RPM
For all operations
except reverse 550 72 579 2200
For reverse (one min.) 500 2100
Engine limits for
all operations Gas Inter Turbine
Torque Propeller Generator Temperature
Lb-Ft RPM RPM Deg. Cent.
1315 2200 38,100* 750**
*Maximum gas generator oversp eed limit - 38,500 rpm for 10 seconds.
**Maximum inter turbine temperatur e during starting - 1994°F. (1090°C) for
two seconds.
Oil temperature Minus 40°F. (-40°C) Minimum
Plus 210°F. ( 99°C) Maximum
Oil pressure At 28,000 rpm gas genera tor speed and higher - 65 psi Minimum
85 psi Maximum
Below 28,000 rpm gas genera tor speed - 40 psi Minimum
2. Two United Aircraft of Canada Ltd. PT6A-27 installed in accordance with the McKinnon Master
Drawing List MPD 90996 dated May 1, 1970, or subsequent FAA approved revisions.
Fuel JP-4 and JP-5 fuels conforming to Pr att & Whitney Aircraft Specification No. 522.
Oil Refer to UACL PT6 Engine Service Bulletin No . 1 for eligible oils. (Not eligible with
MIL-L-7808 type oils.)
Engine ratings (Static Sea Level)
Shaft Jet Equivalent Propeller
Horse- Thrust Shaft Speed
power Lb. Horsepower RPM
For all operations
except reverse 680 90 715 2200
For reverse (one min.) 620 2100
Engine limits (Max for
all operations unless Gas Inter Turbine
noted otherwise) Torque Propeller Generator Temperature
Lb-Ft RPM RPM Deg. Cent.
1628 2200 38,100* 1336 °F. (725°C)**
*Maximum gas generator oversp eed limit - 38,500 rpm for 10 seconds.
Minimum gas generator speed for idle - 19,000 rpm
**Maximum inter turbine temperatur e during starting - 1994°F. (1090°C) for
two seconds.
Maximum inter turbine temperature for idle - 122 F. (660 °C.)
Page 5 of 9 4A24
III - Model G-21E (cont'd)
Oil temperature Minus 40°F. (-40°C.) Minimum
Plus 210°F. ( 99°C.) Maximum
Oil pressure At 27,000 rpm gas generato r speed and higher: 80 psi Minimum
and oil temperature of 140 - 160°F 100 psi Maximum
Below 27,000 rpm gas genera tor speed 40 psi Minimum
Propeller and Two Hartzell constant sp eed propellers, hubs HC-B3TN-3, blades
propeller limits T10178HB. Diameter: Max. 96 in. No further reduction permitted.
Pitch setting at 30 in. station: Low (flight idle) 20° +0° -0.5°,
high (feather) 86° + 1°, reverse -11.0° + 0.5°
Airspeed limits Maximum operati ng speed *211 m.p.h. (183 knots)
Maneuvering speed 174 m.p.h. (151 knots)
Flaps extended speed 110 m.p.h. ( 96 knots)
Landing gear operating speed 160 m.p.h. (139 knots)
Landing gear extended speed 160 m.p.h. (139 knots)
*236 m.p.h. (205 knots) when PT6A-27 engines are installed
C.G. range With PT6A-20 engines
+21.5 to +29.5 at 10,500 lb.
+19.6 to +29.5 at 8,562 lb.
Straight line variation between points given
With PT6A-27 engines
+22.0 to +29.5 at all weights
Empty weight C.G. range None
Maximum weights Takeoff 10,500 lb.
Landing (on land) 10,500 lb.
Landing (on water) 10,500 lb.
Zero fuel weight, land & water 10,182 lb.
Minimum crew One
No. of seats 9. (2 at -5, 2 at +24, 2 at +62, 1 at +118, 1 at +127,
and 1 at +136)
Maximum baggage Fwd. compartment 602 lb. (-65)
Aft compartment 400 lb. (+169)
Fuel capacity 1. Two main tanks (+30)
Total 110 gal., 715 lb. each
Usable 108.5 gal., 705 lb. each
2. Two outboard auxiliary tanks (+30)
Total 60 gal., 390 lb. each
Usable 60 gal., 390 lb. each
3. Optional Main Tanks in lieu of Item 1 above (+30)
Total 168 gal., 1092 lb. each
Usable 166.5 gal., 1082 lb. each
NOTE: Fuel quantity must not exceed weights shown.
See NOTE 1 for system fuel.
Page 6 of 9 4A24
III - Model G-21E (cont'd)
Oil capacity 4.6 gallons total in two integral engine tanks of 2.3 gallons each
3.0 gallons total usable
See NOTE 1 for system oil.
Control surface movements All controls plus (+) or minus (-) 1°
Aileron Up 20° Down 20°
Elevator Up 23° Down 20°
Rudder Right 27° Left 26°
Flaps Down 60°
Elevator tab Up 10° Down 30°
*Rudder tab Right 15° Left 25°
*Set rudder tab 2-1/2° to the left, with indicator (in cockpit) set
on 0° (takeoff position). Left and right travel taken from this position.
Control surface Elevator + 90 + 21 in. lb.
mass balane Rudder +130 + 20 in. lb.
Aileron 0 + 10
- 13.6 in. lb.
Serial Nos. eligible 1211 through 1225
IV - Model G-21G (Normal Category) Approved August 29, 1969
The Model G-21G is similar to the Model G- 21E except for the engine installation, revised fuel system, increased weights and ai rspeed
limits, and related changes.
Engines Two United Aircraft of Canada Ltd. PT6A-27
Optional: Two United Aircra ft of Canada Ltd. PT6A-28
Fuel JP-4 and JP-5 fuels conforming to Pratt & Whitney Aircraft
Specification No. 522.
Oil Refer to UACL PT6 Engine Service Bulletin No. 1001 for eligible oils. (Not eligible
with MIL-L-7808 type oils.)
Engine ratings (Static Sea Level)
Shaft Jet Equivalent Propeller
Horse- Thrust Shaft Speed
power Lb. Horsepower RPM
For all operations
except reverse 680 90 715 2200
For reverse (one min.) 620 2100
Engine limits (Max. for
all operations unless Gas Inter Turbine
noted otherwise.) Torque Propeller Generator Temperature
Lb-Ft RPM RPM Deg. Cent.
PT6A-27: 1628 2200 38,100* 1336 °F. (725°C)**
PT6A-28: 1628 2200 38,100* 1382 °F. (750°C)**
*Maximum gas generator oversp eed limit - 38,500 rpm for 10 seconds.
Minimum gas generator speed for idle - 19,000 rpm
**Maximum inter turbine temperatur e during starting - 1994°F. (1090°C) for
two seconds.
Maximum inter turbine temperature for idle - 122 F (660 °C.)
Page 7 of 9 4A24
IV - Model G-21G (cont'd)
Oil temperature Minus 40°F. (-40°C) Minimum
Plus 210°F. ( 99°C) Maximum
Oil pressure At 27,000 rpm gas generato r speed and higher; - 80 psi Minimum
and oil temperature of 140 - 160°F. 100 psi Maximum
Below 27,000 rpm gas generato r speed - 40 psi Minimum
Propeller and Two Hartzell constant sp eed propellers, hubs HC-B3TN-3, blades
propeller limits T10178HB. Diameter: 96 in. No further reduction permitted.
Pitch settings at the 30 in. station:
Low (flight idle) 20° +0° -0.5°,
High (feather) 86° + 1°, reverse -11.0° + 0.5°
Airspeed limits (EAS) Maximum ope rating speed 236 m.p.h. (205 knots)
Maneuvering speed 174 m.p.h. (151 knots)
Flaps extended speed 110 m.p.h. ( 96 knots)
Landing gear operating speed 160 m.p.h. (139 knots)
Landing gear extended speed 160 m.p.h. (139 knots)
C.G. range (+22.0) (17.0% MAC) to (+29.9% MAC)
Empty weight C.G. range None
Maximum weights Takeoff 12,500 lb.
Landing (on land) 12,000 lb.
Landing (on water) 12,500 lb.
Zero fuel weight, land & water 10,182 lb.
Alternate weight limits for airplanes asse mbled without full main cabin floor sealing.
Takeoff (on land) 12,500 lb.
Takeoff (on water) 10,500 lb.
Landing (on land) 12,000 lb.
Landing (on water) 10,500 lb.
Zero fuel weight, land & water 10,182 lb.
Minimum crew One
No. of seats Ten. (2 at -5, 2 at +29, 2 at +91, 2 at +147.5, and 2 at +177)
Maximum baggage Fwd. compartment 602 lb. (-65)
Fuel capacity 1. Two inboard main tanks (+30)
Total 168 gal., 1092 lb. each
Usable 166.5 gal., 1082 lb. each
2. Two outboard main tanks (+30)
Total 125 gal., 812 lb. each
Usable 118 gal., 767 lb. each
3. Optional outboard tanks in lieu of Item 2 above (+30)
Two outboard auxiliary tanks (+30)
Total 60 gal., 390 lb. each
Usable 60 gal., 390 lb. each
Total fuel for items 1 and 2: 586 gal. with 569 gal useable
Total fuel for items 1 and 3: 456 gal. with 453 gal useable
See NOTE 1(b) for system fuel.
Oil capacity 4.6 gallons total in two integral engine tanks of 2.3 gallons each
3.0 gallons total usable
See NOTE 1(c) for system oil
Maximum operating altitude 20,000 ft.
Page 8 of 9 4A24
IV - Model G-21G (cont'd)
Control surface movements All controls plus (+) or minus (-) 1°
Aileron Up 20° Down 20°
Elevator Up 30° Down 20°
Rudder Right 27° Left 26°
Flaps Down 60°
Elevator tab Up 10° Down 30°
Rudder tab* Right 15° Left 25°
Set rudder tab 2-1/2° to the left, with the indicator (in cockpit)
set on 0° takeoff position. Left a nd right travel taken from this position.
Control surfaces Elevator +90 + 21.0 in. lb.
mass balance Rudder +130 + 20.0 in. lb.
Aileron 0 + 10.0 in. lb.
- 13.6 in. lb.
Serial Nos. eligible 1201, 1203, 1205, 1226 through 1250
DATA PERTINENT TO ALL MODELS
Datum Wing leading edge at side of fuselage (+5.7 in forward MAC leading
edge where length = 95.9 in MAC)
Leveling means 6 in above floor at sta. 9 (Instrument Panel) and sta. 11.
Wing level right side fuselage at sta. 12.
Certification basis Models G-21C and G-21D
CAR 3 effective May 15, 1956 with no amendments.
Models G-21E and G-21G
(1) For the powerplant installati on - FAR 23 including Amendments 23-1
through 23-6
(2) For areas other than the powerplant installation - CAR 3
effective May 15, 1956 with no amendments.
(3) Special Conditions dated May 5, 1969.
(4) Exemption No. 555 from FAR 21.19(b) issued July 6, 1966.
Type Certificate No. 4A24 issued November 7, 1958, amended
June 29, 1960, amended July 17, 1958, amended August 29, 1969.
Application for type certificate dated February 21, 1957.
Production basis Production Certificate No. 409.
Since the Model G-21C, G-21D, G-21E a nd G-21G are conversion of the basic
Grumman Models G-21 and G-21A (Type Cer tificate No. 654), the applicable portions
of the following Airworthiness Directives must be complied with: 49-16-1, 53-20-2,
53-24-1, and 63-27-2.
Equipment The basic required equipm ent as prescribed in the applicable Airworthiness Regulations
(see Certification Basis) must be installed in the aircraft for certification. In addition,
the following items of equipment are required:
(1) Approved equipment as show n in the following McKinnon Reports:
(a) Model G-21C - No. MC-3-3-29
(b) Model G-21D - No. MC-14-20
(c) Model G-21E - No. MPD-90010
(d) Model G-21G - No. MPD-90110
(2) FAA Approved Airplane Flight Manual.
Page 9 of 9 4A24
NOTE 1. (a) Current weight and balance report including lis t of equipment included in certificated empty weight,
and loading instructions when necessary must be in each aircraft at the time of original certification
and at all times thereafter except in the case of operators having an approved weight control system.
(b) The certificated empty weight and corresponding cen ter of gravity location must include system fuel
(unusable) of 18 lb. at (+30) for Models G-21C and G-21D and 20 lb. at (+30) for Model G-21E and
110 lb. at (+30) for the Model G-21G with 586 gal tota l fuel and 20 lb at (+30) for the Model G-21G with
456 gal total fuel.
(c) The certificated empty weight and corresponding cen ter of gravity locations must include system oil
(unusable) of 12 lb. at (-42.5) for Models G-21E and G-21G.
NOTE 2. The following placards must be installed in full view of the pilot unless noted otherwise:
(1) "This airplane must be operated as a normal cat egory airplane in compliance with the FAA Approved
Airplane Flight Manual. No acroba tic maneuvers including spins are approved."
(2) Model G-21C only - "Use auxiliary tank for cruise only."
(3) Model G-21C and G-21D with Lycoming GS O-480-B2D6 engine - "Avoid continuous operation
between 2800 and 3100 rpm."
(4) Models G-21C and G-21D only - "Maximum capacity 300 lb." adjacent to forward baggage
compartment.
(5) Models G-21E and G-21G only - "Maximum capacity 602 lb." adjacent to forward baggage
compartment.
(6) Models G-21C and G-21E only - "Maximum capac ity 400 lb." adjacent to rear baggage compartment.
.....END.....