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SA227 METRO SERIES FAAAPPROVED AIRPLANE
FLIGHT
MANUAL
SUPPLEMENT
FOR SA227-AC, VAPOR
SA227-BC, CYCLE
Registration Serial
SA227-CC
AIR CONDITIONING
AND SA227-DC SYSTEM
No.
No.
This supplement must be attached to the applicable FAA Approved Airplane Flight Manual when a vapor cycle air conditioning system is installed in accordance with Fairchild Aircraft drawing number 27-84300 or 27K84300. The information contained in this document supplements or supersedes the basic manual only in those areas listed. For limitations, procedures, and performance information not contained in this supplement, consult the basic Airplane Flight Manual.
FAA Approved by: Michele M. Owsley Manager, Airplane Certification Federal Aviation Administration Ft. Worth, Texas 76193-0100
Off ice
Date:
VAPOR CYCLE AIR CONDITIONING FAA Approved: JU L 09/92
Supplement Page 1 of 6
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SA227 METRO SERIES LIST OF REVISIONS
Revisions to the Airplane Flight Manual provide current information applicable to operation of the SA227-AC/BC/CC/DC aircraft. Revised pages should be inserted in the manual to replace existing pages or to add additional pages, as applicable. The manual is valid only when all current revisions are incorporated. Revision Number 1
I
Revised Pages 2, 3
FAA Approved Description of Revision
Signature
Date
Added Maximum Weights and corrected baggage compartment loads.
2
2, 3
Changed aft baggage compartment load.
3
2,4 and 5
Corrected circuit breaker info, eEdqljiOptnt &y:, ,a,;ton ;dded
4
2 and 3
Added placard.
A black bar in the margin of a revised page shows the current change Supplement Page 2 of 6
VAPOR CYCLE AIR CONDITIONING FAA Approved: JU L 09192 Revised: APR 27/94
SA227 METRO SERIES SECTION 1 . . . . . . .LIMITATIONS The standby compass must not be used when the vapor cycle air conditioner is in operation. Fan only operations are permitted. Operation of the air conditioning system is prohibited: 1. When using only battery power. 2. When operating on one generator. MAXIMUM WEIGHTS The placarded useful baggage compartment load (baggage and cargo) has been reduced by the weight of the installed air conditioning equipment, as follows: Forward baggage compartment ........................................................................ 40 Pounds (18 kg) Aft baggage compartment ................................................................................. 65 Pounds (29 kg) NOTE If the structural bulkhead is moved forward of F.S. 437, cargo must be secured to protect the evaporator from damage. PLACARDS NEXT TO STANDBY MAGNETIC COMPASS STANDBY COMPASS IS UNRELIABLE WITH VAPOR CYCLE AIR CONDITIONER SYSTEM IN OPERATION
ON LOWER RIGHT INSTRUMENT PANEL ABOVE VAPOR CYCLE A/C SWITCHES DO NOT OPERATE THE VCAS WITH OAT BELOW 75° F (24° C) FOR MORE THAN 15 MINUTES
DO NOT OPERATE THE VCAS ABOVE 10,000 MSL OR 3,000 FEET AGL FOR AIRPORTS ABOVE 7,000 MSL
SECTION 2 . . . . . . .NORMAL PROCEDURES AIR CONDITIONING SYSTEM The air conditioning system consists of an electrically powered compressor located in the rear fuselage, a condenser unit located in the nose of the aircraft and two evaporator units located in the forward and aft cabin. The air conditioning system may be operated using a ground power unit (GPU) or with both generators operating. The evaporator blowers may also be used as fans in the high and low modes without operating the air conditioning compressor. VAPOR CYCLE AIR CONDITIONING FAA Approved: JUL 09/92 Revised: APR 27/94
Supplement Page 3 of 6
SA227 METRO SERIES SECTION 2 . . . . . . .NORMAL PROCEDURES (continued) AIR CONDITIONING SYSTEM (continued) An air conditioner AIR CONDITION – OFF – FAN rocker switch is located on the copilot's lower instrument panel. Two evaporator blower HI – LOW rocker switches are located adjacent to the air conditioner switch. These switches are labeled FWD EVAP and AFT EVAP. The evaporator switches provide low and high speed operations. Five circuit breakers provide electrical protection for the system. The name and location of the circuit breakers are: 1. Compressor Motor (180 Amps) ........................................... Inboard side of electrical junction box behind the pilot's seat. 2. Condenser Cooling Fans (2) (25 Amps) ............................. Inboard side of electrical junction box behind the pilot's seat. 3. Air Conditioning Control (2 Amps) ...................................................... Nonessential bus C/B panel 4. Blower (20 Amps) ............................................................................... Nonessential bus C/B panel The compressor motors and condenser fan units are powered by the aircraft battery bus through a power relay. The power relay and the evaporator fans are powered by the nonessential bus. When the nonessential bus is OFF, the entire air conditioning system is disabled. A load shedding circuit will deactivate the power relay whenever the battery bus is not powered by both generators, or during GPU engine starts. The load shedding circuit does not affect the operation of the evaporator fans. AIR CONDITIONER OPERATION (AIR OR GROUND) NOTE A ground power unit (GPU) must be used for ground operation unless both generators are operating. Start Up: 1. Air Conditioner Switch ......................................................................................... AIR CONDITION 2. FWD and AFT EVAP Switches .......................................................... HI OR LOW (AS DESIRED) Shut Down: Air Conditioner Switch ................................................................................................................. OFF Cabin Fan Operation Only: 1. Air Conditioner Switch ............................................................................................................. FAN 2. FWD and AFT EVAP Switches .......................................................... HI OR LOW (AS DESIRED) Supplement Page 4 of 6
VAPOR CYCLE AIR CONDITIONING FAA Approved: JUL 09/92 Revised: MAR 29/94
SA227 METRO SERIES SECTION 3 . . . . . . .EMERGENCY PROCEDURES ENGINE FAILURE Air Conditioner Switch ................................................................................................................. OFF
SECTION 3A . . . . . . .ABNORMAL PROCEDURES GENERATOR INOPERATIVE Air Conditioner Switch ................................................................................................................ OFF
SECTION 4 . . . . . . .PERFORMANCE No Change
SECTION 5 . . . . . . .WEIGHT AND BALANCE EQUIPMENT LIST
QTY
UNIT DESCRIPTION
TOTAL WEIGHT (POUNDS)
MOMENT ARM (INCHES)
1
Compressor
13
539
1
Evaporator (Aft)
15
428
1
Evaporator (Fwd)
9
144
1
Filter
3
532
1
Motor Assembly
20
545
2
Motor/Condensor Assembly
16
9
1
Receiver/Dryer
1
428
1
Receiver/Dryer
1
151
1
Timer Assembly
2
539
SECTION 6 . . . . . . .MANUFACTURER’S DATA No change. VAPOR CYCLE AIR CONDITIONING FAA Approved: JUL 09/92 Revised: MAR 29/94
Supplement Page 5 of 6
SA227 METRO SERIES
THIS PAGE LEFT BLANK INTENTIONALLY
Supplement Page 6 of 6
VAPOR CYCLE AIR CONDITIONING Manufacturer's FAA Approved: Data: JUL 09/92