ZENITH CH 750
AMATEUR BUILT
LYCOMING O-235 C1 115 H.P.
PILOT OPERATING HANDBOOK
Serial number: 75 - 8433
Registration: C-FJUV
Owner and Manufacturer
Mark A. MALTAIS
Thunder Bay, Ontario
Canada
Revised
12 May 2015
SECTIONS1. General Page 4
2. Airplane and System Description Page 7
3. Limitations Page 12
4. Normal Procedures Page 22
5. Amplified Procedures Page 31
6. Emergency Procedures Page 36
7. Performance Specifications Page 39
8. Weight and Balance Page 42
9. Aircraft Construction and Design Page 44
10. Maintenance Program Page 52
11. Airplane Features and Diagrams Page 59
WARNING!
THE OWNER AND OPERATOR MUST UNDERSTAND THAT DUE
TO INHERENT RISK INVOLVED
IN FLYING AN AIRCRAFT, NO WARRANTY IS MADE OR
IMPLIED, OF ANY KIND, AGAINST ACCIDENTS, BODILY INJURY OR DEATH OTHER THAN THOSE, WHICH CANNOT BY
LAW BE EXCLUDED.
THE SAFE OPERATION OF THIS AIRCRAFT RESTS WITH YOU,
THE PILOT. I BELIEVE THAT IN ORDER TO FLY SAFELY
YOU MUST MATURELY PRACTICE AIRMANSHIP.
OPERATIONS OUTSIDE THE RECOMMENDED FLIGHT
ENVELOPE SUCH AS AEROBATIC MANOEVRES OR ERRATIC
PILOT TECHNIQUE MAY ULTIMATELY PRODUCE EQUIPMENT
FAILURE. YOU ARE REFERRED TO THE OPERATING
LIMITATIONS IN THIS MANUAL.
LIKE ANY AIRCRAFT, SAFETY DEPENDS ON A COMBINATION
OF CAREFUL MAINTENANCE
AND YOU’RE ABILITY TO FLY INTELLIGENTLY AND
CONSERVATIVELY. I HOPE THAT THIS AIRCRAFT WILL
PROVIDE YOU WITH MANY HOURS OF SAFE AND
ENJOYABLE FLYING.
SECTION 1
GENERAL
INTRODUCTION
This Pilot Operating Handbook (POH) is designed for maximum utilization as operating guide for the pilot. It includes the material required by the regulations to be furnished to the pilot. It also contains supplemental data supplied by the airplane manufacturer.
This Pilot Operating Handbook is not designed as a substituted for adequate and competent flight instruction, knowledge of current airworthiness directives, applicable air regulations or advisory circulars. It is not intended to be a guide for basic flight instruction or a training manual and should not be used for operational purposes unless kept in a current status.
Assurance that the airplane is in an airworthy condition is the responsibility of the owner. The pilot in command is responsible for determining that the airplane is safe for flight. The pilot is also responsible for maintaining within the operating limitation as outlined by instrument markings, placards, and this Pilot Operating Handbook.
Although the arrangement of this Pilot Operating Handbook is intended to maximize its in-flight capabilities, it should not be used solely as an occasional operating reference. The pilot should study the entire Pilot and operational handling characteristics of the airplane before flight.
The Pilot Operating Handbook has been divided into numbers sections. The limitations and emergency procedures have been place ahead of the normal procedures, performance and other sections to provide easier access to information that maybe required in flight. The “Emergency Procedures” Section is quickly available, to present instant reference. Provisions for the expansion and/or updates to this Pilot Operating Handbook (POH) have been made.
Before flying the aircraft, read and familiarize yourself with this PHO, the Engine Operators Manual and Maintenance Manual.
This pilot’s handbook provides pilots with the information required for the safe and efficient operation of this aircraft.
CERTIFICATION BASIS
This aircraft is operating under a SPECIAL CERTIFICATE OF AIRWORTHINESS and classified as “Amateur Built”. See CAR’s 5.3.3
WARNINGS, CAUTIONS AND NOTES
The following definitions apply to warnings, cautions and notes used in the Pilot Operating Handbook.
WARNING: Means that the non-observations of the corresponding procedure lead to an immediate degradation of flight safety which could result in loss of life or destruction of equipment.
CAUTION: Means that the non-observation of the corresponding procedure leads to a degradation of flight safety resulting in damage to the equipment.
NOTE: Draws the attention to any item that is important or unusual.
SECTION 2
AIRPLANE AND SYSTEMS DESCRIPTION
WING SPAN...... 29 Ft. 9 In. (9.1m)WING AREA...... 13.4 m2 (144.2 Sq. Ft.)
WING CHORD...... 4 Ft. 10 In. (1.47 m)
LENGTH...... 21 Ft. 10 In. (6.7 m)
HEIGHT...... 8 Ft. 1 In. (2.6 m)
HORIZONTAL TAIL SPAN………………………8 Ft. 8 In (2.64 m)
HORIZONTAL TAIL AREA……………………….22.2 Sq. Ft. (2.06 Sq. m)
WING LOADING...... 44.8 kg/ m2 (9.2 lbs/s.f.)
POWER LOADING…………………………………12.5 LBS/BHP
DESCRIPTION
The Zenith CH-750 is a side-by-side two place, strut-braced high wing monoplane with all-metal structure and surfaces. It has fixed leading edge slats and Junkers style flaperons. Equipped with “bubble” doors, a large wrap-around windshield, a tinted Lexan roof and gull wings, the CH-750 has unmatched visibility. This CH-750 is equipped with a 115 horsepower Lycoming O-235 C1 engine.
THIS CH750 STOL IS BUILT TO PLANS VERSION REVISION 2 STANDARDS.
MAX DESIGN WEIGHT...... 1440 lbs/655 kgEngine...... Lycoming O-235 C1
Propeller...... Warp Drive 3 Blade
Full carbon fiber with
aluminum hub
Diameter...... 72 inches
SYMBOLS, ABBREVIATIONS AND TERMINOLOGY
The following definitions are of symbols, abbreviations and terminology used through the handbook and those which may be of added operational significance to the pilot.
GENERAL AIRSPEED TERMINOLOGY AND SYMBOLS
BHP Brake horsepower (=rated horsepower of the engine)
CAS Calibrated Airspeed means the indicated speed of an
aircraft, corrected for position and instrument error.
Calibrated airspeed is equal to true airspeed in standard
atmosphere at sea level.
GPH Fuel consumption in Gallons (U.S.) per Hour.
KCAS Calibrated Airspeed in “Knots”.
C.G. Centre of Gravity.
IAS Indicated Airspeed is the speed of an aircraft as shown on
the airspeed indicator.
KIAS Indicated Airspeed expressed in “Knots”.
L Left
R Right
RPM Revolutions per minute.
S.L. Sea Level
TAS True airspeed is the airspeed of an airplane relative to
undisturbed air which the CAS corrected for altitude and
temperature.
V Speed
VA Maneuvering Speed is the maximum speed at which the
controls may be full (and smoothly) deflected in calm air as
long as +4/-2 g is NOT exceeded. Do NOT make full or
abrupt control movements above this speed.
VFE Maximum Flap Extended Speed is the highest speed
permissible with wing Flaperons partially or fully extended.
SECTION 3
LIMITATIONS
This section includes operating limitations, instrument markings and basic placards.
Airspeeds / MPH (KNOTS)VNE Never Exceed Speed / 125 (108)
VNO Max. Structural Cruising Speed / 105 (91)
Vc Design Cruise / 100 (87)
VA Maneuvering Speed / 80 (70)
VFE Maximum Flap Extended Speed / 75 (65)
VS1 Stall -NO FLAP / 40 (35)
VS0 Stall –FULL FLAPS / 35 (30)
Remarks:
Vne / Do not exceed in any operation.Vno / Do not exceed except in smooth and then only with caution.
Va / Do not make full or abrupt control movement above this, under certain conditions the aircraft may be overstressed by full control movements.
Vfe / Do not exceed with flaps extended.
Markings: IAS values or ranges:
White arc: / Vf 35-75 / Flap Operating RangeGreen arc: / Vs 40 -105 mph / Normal Range
Yellow arc: / 105-125 mph / Caution Range
Red Line: / 125 mph / Never Exceed Speed
Powerplant:
Engine manufacturer...... Lycoming
Engine Model...... O-235 C1
RATING:
Max. continuous horsepower, RPM Sea level pressure altitude / 108 HP – 2600 RPM – S.L.Takeoff (5 min.) HP, at full Throttle / 115 HP – 2800 RPM (15 Min. Max)
Fuel (minimum grade aviation)** / 80/87 or 100 LL
**NOTE: Automotive Gasoline (MOGas) is approved in this aircraft. It must be Premium fuel only with NO ETHANOL content.
Lubricating Oil / Lycoming Spec. No. 301-F and ServiceInstructions No. 1014 ***
***NOTE: Lubricants should conform to the specifications as listed or later revisions thereto.
Maximum Power, take-off ...... 115 HP
Max continuous: ...... 108 HP
Maximum Engine RPM, (15min max)……...... 2800 rpm
Continuous ...... 2600 rpm
Minimum idle ………...... 600 rpm
Recommended idle...... 800 rpm
Propeller Drive Ratio…………………………………1:1
Propeller Shaft Rotation……………………………Clockwise
Propeller shaft end size……………………………Integral flange-SAE Type 2
Ignition, timing BTC………………………………25 Degrees
Oil sump capacity…………………………………6 Quarts*
Usable oil……………………………………………4 Quarts
*NOTE: To minimize the loss of oil through the breather, fill to 5 quart level for normal flights of less than 3 hours. For extended flight, fill to 6 quarts.
Bore, Inches………………………………………4.375
Stroke, Inches……………………………………3.875
Displacement, Cubic Inches…………………..233.3
Compression Ratio………………………………6.75:1
Dry Weight………………………………………..246 lbs
Cruise Speed – Performance…………………2350
Cruise Speed – Economy……………………..2250
Fuel Consumption – Economy ……………….6.1 Gal/hr
Maximum Cylinder Head Temp……………….500 F
Maximum Oil temperature…………………….190-240F
Spark Advance…………………………………..25 Degrees BTC
Oil Pressure (PSI) / PSINormal / 65-85 PSI
Maximum / 90 PSI
Minimum / 60 PSI
Minimum Idling / 25 PSI
Magneto Drop-off, Maximum @ 1800 RPM
Each magneto alone……………………125
Difference between Magnetos…………35
Magnetos (BENDIX)
Right………………………………………S4LN-20
Left (impulse)……………………………S4LN-21
Carburetor
Marvel-Schebler……………………………………MA-3A
Fuel Pressure
Maximum…………………………………8 PSI
Desired……………………………………3 PSI
Minimum…………………………………0.5 PSI
Fuel grade
Unleaded (MoGAS)…………………91 Octane Ethanol Free
Avgas…………………………………100L
OIL GRADES:*
Average Ambient Air / MIL-L-6082 GradesAbove 80F (27C) / SAE 60
Above 60F (16C) / SAE 50
30F to 90F (-1 – 32C) / SAE 30
Below 10F (-12C) / SAE 20
*NOTE: For simplicity AeroShell 100W can be used in summer and AeroShell 50W used in winter.
Oil Consumption Maximums
0.06 l per hour
0.80 Quarts/hr
CHARACTERISICS OF THE LYCOMING O-235 C1:
Four cylinder, horizontally opposed, air cooled, direct drive. Has provisions for dual pump drives. Eligible for both tractor and pusher type installations.
Propeller manufacturer: Warp Drive 3 blade 72” with nickel plated leading edges
POWERPLANT INSTRUMENT MARKINGS*
Minimum limit / 600 RPMGreen Arc / 1800-2600 RPM
Yellow Arc / 2600-2800 RPM
Red line / 2800 RPM
Normal operating / 1900-2600 RPM
Oil Temperature / 50C-118C (190-245F)
*NOTE: These markings are displayed on MGL Engine Management System (EMS) display and Tachometer. Do not exceed 2600 RPM for more than 5 minutes.
Average Ambient AirTemperature / Oil Inlet Temperature
Desired* / Maximum
Above 60F (16C) / 180F (82C) / 245F (118C)
30-90F (-1 to 32C) / 180F (82C) / 245F (118C)
0-70F (-18 to 21C) / 170F (77C) / 245F (118C)
Below 10F (-12C) / 160F (71C) / 245F (118C)
*NOTE: Engine oil temperature should not be below 140F (60C) during continuous operation.
OTHER LIMITS:
Cyl. head temp. / 260C (500F) maxFuel pressure / 2–5 PSI (Min. 0.5)
Fuel and Oil Consumption:
Operation / RPM / HP / Fuel Cons.Gal./Hr. / Max Oil
Gal.Hr. / Max Cylinder Head Temp
Normal Rated
(15 Min. Max) / 2800 / 115 / 10.7 / 0.52 / 500F (260C)
Performance
Cruise (75%) / 2350 / 86 / 7.3 / 0.29 / 500F (260C)
Economy
Cruise (65%) / 2250 / 75 / 5.8 / 0.25 / 500F (260C)
WEIGHTS / LBS / KG
Basic Empty weight / 905 / 411
Maximum take-off weight / 1440 / 655
Maximum landing weight / 1440 / 655
Maximum cockpit weight / 535 / 243
Minimum cockpit weight / N/A / N/A
Max. weight in Baggage area / 40 / 18
Centre of gravity:
Standard center of gravity position for empty aircraft is 278 mm from reference datum.
Reference datum is leading edge of slats.Allowable Range: 19 - 34% 280 to 500mm/11 to 20 inches)
Equipment list:
Dynon D100 EFIS
MGL EMS (Engine Monitor System)
Bendix King KX-155 Nav/Com
ELT
Tachometer – mechanical (Supplementary to EMS DigitalTach)
Landing lights with Wig Wag Function on slats (High Intensity LED’s)
Strobe lights on wing tips (High Intensity LED’s)
Navigation lights on wing tips (High Intensity LED’s)
Maneuvers:
No aerobatics maneuvers including intentional spinning are permitted!Maneuvering load factors:
Limit load factor: + 6g / -3g*
*NOTE: The ultimate load factors are the limit-load factors multiplied by the safety factor of 1.5.
Flight crew:
Minimum number of crew members is 1 and maximum total number of occupants is 2
This airplane may be operated in day and night VFR in non-icing condition.
Fuel:
Total capacity………………………………………………30 Gallons/112 Lt
Usable fuel…………………………………………………..28 Gallons/106 Lt
Unusable fuel………………………………………………2 Gallon/8 Lt
APPROVED FUELS:91 Premium Unleaded NO ETHANOL!
100 LL Avgas
Tires:
Main - Carlisle 800-6 20psi
Nose - Carlisle 800-6 20psi
Limitation placards*:
Never-exceed speed / 125 MPHManeuvering Speed / 80 MPH
Maximum speed flaps extended / 75 MPH
Maximum Engine RPM (Take-Off) / 2800 RPM
Max Continuous RPM / 2600 RPM
Max. Cylinder Head Temperature / 260C/500F
Maximum Oil temperature / 118C/245F
*NOTE: The following limitation placards are placed inside the cockpit
NO LOOSE ITEMS ARE PERMITTED IN CABIN!
SECTON 4
NORMAL PROCEDURES
This provides checklists and normal procedures for the conduct of normal operation.
Pre-flight inspection walk around:
1. Ignition switch off, fuel open, controls free.
2. Drain gascolator and all drain valves (One (1) under each wing near the root) to ensure that no water is in the fuel lines check cowl fasteners for looseness, check spinner and prop. Check fuel quantity (use of a marked dipstick recommended) and that fuel caps are secure.
3. Make a visual check of the front wing attachment points, pitot, static ports, upper forward strut attachment, condition of slats and wing tip.
4. Flaperon, check general condition, hinges, rear strut attachment, flaperon control and rear wing attachment points
5. Landing gear condition, attachments, tires
6. Stabilizer attachments, elevator and rudder hinges, cables and attachments, controls
Before starting engine:
Operate controls and make a visual check for proper operation.
Check brakes, and fasten and check safety belt.
Give a passenger briefing if required.
Starting engine:
(Refer also to the engine Manual for more details).
1. Fuel valve Select tank (“Both” Recommended for startup and take-off)
2. Carburetor Heat – COLD
3. Prime – AS REQUIRED (up to 3 strokes).
4. Throttle – OPEN ½ INCH.
5. Propeller Area – CLEAR
6. Master Switch – ON.
7. Ignition Switch – START (release when engine starts).
8. Throttle – Adjust for 1000 RPM or less.
9. Warm-Up Engine until Oil Temperature Rises, Take off When Temperature is Green (140F (60C) recommended).
NOTES:
Starter limit Max 10sec. Cool 2 min
-Check oil pressure rise within 20-30 sec. after start.