DIFFERENCES

ATR-42-500 & ATR-72-500

Compiled by:-

1. Mr. Aizaz Ul Haq (Instructor ATR)

2. Mr. Abrar Ahmed (Instructor)

AIRCRAFT SYSTEMS

Aircraft General

(a) Dimensions and Ground Clearances.

ATR 42-500 ATR 72-500

ATR-42-500 ATR-72-500

AIRCRAFT SYSTEMS (Cont’d)

(b) Turning Capability on Ground.

ATR 42-500 ATR 72-500

AIRCRAFT SYSTEMS (Cont’d)

(c)Tail Prop and tail Bumper.

ATR 42-500 ATR 72-500

Not Installed

AIRCRAFT SYSTEMS (Cont’d)

Emergency Equipment ATR 42-500 ATR 72-500 Not equipped with megaphone Equipped with megaphone Portable Oxygen bottles (green) with Portable Oxygen bottles (green) with Pressure gauge and recharge valve Pressure gauge and recharge valve 1 bottle 2 bottles Passenger Oxygen masks equipped with valves, Passenger Oxygen masks equipped with valves Bag and elastic strap bag and elastic strap. Location and number 12 according to accommodation. Protective breathing equipment (PBE) Protective breathing equipment (PBE) to supply 15 minutes pure oxygen with to supply 15 minutes pure oxygen with Hood, visor, speaking diaphragm and hood, visor, speaking diaphragm and oronasal mask. oronasal mask. 2 3

AIRCRAFT SYSTEMS (Cont’d)

Flight Controls

ATR 42-500 ATR 72-500

Rudder Travel Limitation Unit (TLU) LO SPD Rudder Travel Limitation Unit (TLU) LO Green light illuminates when aircraft SPD green light, illuminates when Speed < 190 Kts. Aircraft speed < 180 Kts. Rudder Travel Limitation Unit (TLU) LO SPD Rudder Travel Limitation Unit (TLU) LO SPD Green light goes OFF when aircraft green light goes OFF when aircraft Speed > 195 Kts. Speed > 185 Kts. TLU Guarded Switch on Overhead Panel TLU Guarded Switched on Overhead Panel (Manual Operation) (Manual Operation)

> 195 Kts - HI SPD > 185 Kts - HI SPD

TLU Guarded switched on overhead panel TLU Guarded Switched on Overhead Panel (Manual Operation) (Manual Operation) < 190 Kts - LO SPD < 180 Kts - LO SPD

Rudder TLU LO speed light Rudder TLU LO speed light Illuminates illuminates RUD TLU RUD TLU LO SPD OR (According to Version)

Flaps Control Lever Position Flaps Control Lever Position 0⁰, 15⁰, 25⁰, 35⁰ 0⁰, 15⁰, 30⁰ Flaps Position Indicator Flaps Position Indicator 0⁰, 15⁰, 25⁰, 35⁰ 0⁰, 15⁰, 30⁰

LO SPD OK LO SPD

AIRCRAFT SYSTEMS (Cont’d)

Fuel System

ATR 42-500 ATR 72-500

(a) Total Fuel Quality. 4500 Kg 5000 Kg

(b) Refueling Point. Under Right Wing Rear Part of RH Main

Landing Gear Fairing

(c) Complete Refueling Time. 15 minutes 16 minutes.

(d) Illumination of Fuel Clog Light. The light illuminates amber The light illuminates amber

when fuel pressure loss in HP fuel when fuel pressure loss in HP

filter exceeds 25 Psi. fuel filter exceeds 45 Psi.

Landing Gear Brake Temp Hot light on Front Brake Temp Hot light on Front Instrument Panel illuminates when Instrument Panel illuminates when Temperature > 160⁰ C temperature > 150⁰ C

Ice & Rain Protection

Deicing Distribution valves Deicing Distribution valves

6 7

AIRCRAFT SYSTEMS (Cont’d)

Power Plant

ATR 42-500 ATR 72-500

(a) Engine Installed. PW 127 E PW 127 F

OR OR

PW 127 M PW 127 M

(b) Power Settings.

(i) RTO (Reserve Take Off) 2400 SHP 2750SHP

(ii) MCT (Maximum Continuous) 2160 SHP 2500 SHP

Thrust)

(iii) TO (Take off 0.9 RTO) 2160 SHP 2475 SHP

(iv) Climb 2160 SHP 2192 SHP

(v) Cruise 2132 SHP 2132 SHP

(c) Power Management.

(i) M.C.T (Maximum Continuous Np (Prop RPM) = 100% Np (Prop RPM) = 100%

Thrust) TQ (Torque) = 100% TQ (Torque) = 90.9%

(ii) CLB (Climb) Np = 82% Np = 82%

TQ = 109.7% TQ = 97%

(iii) CRZ (Cruise) Np = 82% Np = 82%

TQ = 108.3% TQ = 94.5%

AIRCRAFT SYSTEMS (Cont’d)

ATR 42-500 ATR 72-500

(d) ATPCS (Automatic Take Off Power Pwr Mgt Sel on T.O. Pwr Mgt Sel on T.O.

Control System) + ATPCS Pb in + + ATPCS Pb in +

Arming Conditions. Both PL >49⁰ + both PL >49⁰ +

Both TQ >53% both TQ >46%

Arm green LT on. Arm green LT on.

(e) ATPCS Triggering Condition. One Torque below One Torque below

21% 18%

(f) Torque Indicator markings.

(i) Red dashed radial 121.8% 106.3%

(ii) Red dot 137% 120%

IMPORTANT NOTES:

The ATR-72 aircraft is prone to tail strike at take off and landing phases. Crew is to be extra cautious during these phases of flight. The rotation

during take off should be slow and progressive and initially pitch should not be more than 8 degrees.

During Landing phase, Pitch should never cross 8 degrees, PM is to monitor the Pitch and call “PITCH 7 DEGREES” whenever pitch reaches 7

degrees threshold.

Tail Prop shall always be installed when aircraft is parked. Captains are to ensure that Tail Prop is installed before Boarding and Off Loading of

Pax at departure and destination airports. In case, if only 07 Pax move to the rear of the aircraft, without Tail Prop installed, aircraft tail can

touch the ground.