Seneca-PA34 T Master Briefing Book Flashcards

Flashcards covering general specifications, engine data, airspeed limitations, propeller mechanics, aircraft systems, and flight procedures for the Seneca-PA34 T.

TSIO-360KB and LTSIO-360KB

The Left and Right engine model numbers respectively for the SENECA-PA34 T.

7:5:1

The compression ratio of the Teledyne Continental six cylinder engine.

Total Usable Fuel

The total amount of usable fuel is $123.0\,U.S.\,GALLONS$.

Takeoff Weight

The maximum certificated takeoff weight is $4750\,Lbs.$.

78.4 inches

The distance ahead of the wing leading edge where the datum is positioned for measuring center of gravity limits.

Blue Line

Marking at $92\,KIAS$ indicating One engine inoperative Best Rate of climb speed ($V_{yse}$).

White Arc

The Full Flap Operating Range with a KIAS value range of $64\text{ - }115$.

Vle

Maximum Landing Gear Extension Speed, which is $130\,Knots$.

Vmca

Air Minimum Control Speed ($66\,Knots$), the lowest speed the aircraft is controllable with one engine at take-off power, gear up, and flaps in take-off position.

Va

Design Manoeuvring speed or gust speed, which is $140\,Knots$ at $4750\,Lbs.$ and $114\,Knots$ at $3205\,Lbs.$.

Angle of Attack

The angle between the propeller blade chord and the relative airflow.

Blade Angle

The angle between the blade chord and the plane rotation.

Geometric Pitch

The distance the propeller would travel forward in one complete revolution if it were moving through the air at the blade angle.

Effective Pitch

The distance which a propeller actually moves forward in each revolution, also called advance per revolution.

Propeller Slip

The difference between the geometric pitch and the effective pitch.

Torque

The equal and opposite reaction to the propeller being rotated, generating a turning moment about the aircraft longitudinal axis.

Aerodynamic Twisting Moment (ATM)

Twisting moment which attempts to increase blade angle from the center of pressure.

Centrifugal Twisting Moment (CTM)

Twisting moment which attempts to decrease the blade angle.

Constant Speed Propeller

A controllable-pitch propeller whose pitch is automatically varied in flight by a governor to maintain constant RPM despite varying air loads.

Speeder spring

Located between the threaded shaft and the flyweights in the governor; its tension is adjusted by the pilot via the prop control lever.

Pilot Valve

A governor component moved by flyweights that allows oil to flow into or out of the propeller hub.

Underspeed

A situation where engine speed decreases (e.g., in a climb), causing flyweights to fall inward and the pilot valve to move down, reducing blade pitch.

Feathering

The process of increasing blade pitch until the chord line is approximately parallel to the on-coming airflow to stop wind milling.

Anti-servo tab

A tab mounted on the trailing edge of the stabilator that improves longitudinal stability and provides longitudinal trim.

Squat switch

A switch on the left main gear that deactivates the stall warning horns while the aircraft is on the ground.

Alternate Air

Secondary, unfiltered air sourced from inside the engine cowls used if the primary induction air filter becomes blocked.

Propeller Synchrophraser

An system used to minimize resonance between two propellers; the left engine acts as the master and the right as the slave.

ADA (Asymmetric Decision Altitude)

A decision height established at $300\,ft\,AGL$ for single-engine overshoots; below this height/altitude, the pilot is committed to a landing.

Vsse (Intentional One Engine Inoperative Speed)

The lowest speed for rendering one engine inoperative during pilot training ($85\,knots$ for the PA-34).

Crab method

A crosswind landing technique executed by establishing a heading toward the wind with wings level to keep the ground track aligned with the runway centerline.

Ballooning

A condition during flare out where altitude is gained and the airplane approaches a stall because the pilot increased pitch attitude and AOA too rapidly.

PIO (Pilot Induced Oscillations)

Pitch oscillations caused by improper attitude at touchdown, often resulting from forcing the airplane onto the runway with too much speed.

Critical Engine

The engine that, if failed, produces the largest yawing moment; the PA-34 has no critical engine due to counter-rotating propellers.