Prepare the students for their multiengine
practical training.
Go through the various elements that pertain to
Multi engine transition.
-
Piper Seminole POH
-
Introducing ( 10 minutes )
-
Presentation ( 45 minutes )
-
Summary ( 10 minutes )
Get things started and let everybody get
settled in.
Getting
ready for the lesson
-
The high wing loading PA 44 VS RG
o The drag curves / Speed polar
o Sink rates / Best climb speed
o What happens when one engine is lost
-
General ( section 1 POH )
o
Category
o
Weights
o
Important speeds
o
General characteristics of the
aircraft.
§ Trim
§
Handling ( general and compared to the RG )
§
Speed range
( Vy – Vno ) 25 % higher speed range typical.
· PA 44 : 81 kt
· RG : 61 kt
-
Propellers ( 7 – 5 )
o
Basic propeller theory
(Definitions )
§
Blade angle
§
Pitch angle ( High increased pitch – low RPM, Low decreased pitch – high RPM )
·
How airspeed changes the pitch angle
§
Geometric pitch / Effective pitch
·
Propeller slip is the difference between the 2
§ Propeller effectiveness
o
Description of the PA 44
propeller system
§
Seeks Towards HIGH pitch
§
Spring / Gas loaded
§
Oil pressure adjusts towards Low pitch / High
RPM – AUTOFEATHER !
o
Description of the governor
§
Define governor range
§
Basic operation
o
Define feathering
§
The feathering locks
·
950 RPM
o
Reminder of the Proper sequence of
power usage / Power settings
-
Description of the landing gear
system
o
The fluid reservoir
§
Electric driven
§
1400 – 1800 PSI
§
Located in the Baggage compartment
§
The gear is held up by hydraulic pressure
§
Squat switch on left main leg.
-
Operation
o
REVERSIBLE pump ( VS RG )
§
The gear lever
o
Down lock hooks
§
Spring aided
o
Limits switches ( Gear pump )
o Operating speeds
§
DOWN 140
§
UP 109 – Because of the airspeed force
-
The indicator lights
o
The NAV light feature
-
The Free fall feature
o
Gear selector in the DOWN position
o
Airspeed 100 kt max
o
Releasing pressure
§
Possible YAWING to lock in position
-
Description
o
Two tank a`55 gals – 54 usable
o
2 Vents under each wing / anti freeze feature
o
Draining system
-
Engine driven pumps
o
Location
-
Electric fuel pumps
o
Backing up
o
Take off and landing
-
The other fuel pumps
o
Primers
§
Directly into cylinder
o
Heater pump
§
Only for cruise
-
The cross feed system
o
Description
o
Why only for level / cruise flight
-
Battery
o
12V 35 A
o
Forward compartment
-
Alternators
o
60 A / each engine
o
14 V supply
o
2000 rpm for full output
o
Over voltage relay at 17 V
o
Review of the alternator / Generator
-
External power ( 4 – 15 )
o
BAT / ALT OFF before connection
o
DISCONNECT BEFORE turning on BAT / ALT
-
Failures ( 3 – 20 )
o
Under voltage
§
Turn off / check breakers
§
Turn off BAT / ALT, then ALT on
o
Over voltage
§
Turn off / check breakers
§
Turn off BAT / ALT, then ALT on
-
0,10, 25, 40 setting
-
Step usable in the UP position only
-
Max 25 for single engine work
-
Under left wing
-
Alternate static source
o Vindows closed
o Vents closed
Heating
/ ventilation system ( 7 – 27 )
-
Fresh air intake in the vertical stabilizer
-
Heater in the front
o
Off for take off / landing ( Takes fuel
pressure )
§
Intake lever fully open
§
Rocker switch to HEAT
§
In-flight – RAM air
Ground – Vent blower
§
STOP – use fan 3 minutes before shutdown!
-
One pump on each engine
o Shear protected
Main points
from above
Max weight Seminole
3800 lb
Max weight RG 2650
lb
Wing
loading ~ 15
lb / sq ft.
-
The
Different wing profiles of the two aircraft. (
7.3 )
-
Explain
why the Seminole will glide at a higher sink rate
-
The
final conclusion
o The dramatic loss of performance if
one engine is lost.