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Piper PA-28 Dakota · Systems Description

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Overview

This document serves as a systems description and training guide for the Piper PA-28 Dakota, specifically the PA-28-236 model introduced in 1979. It provides essential information for pilots preparing for their checkout in the Dakota, focusing on its systems, operational procedures, and performance characteristics. The document includes a questionnaire designed to familiarize pilots with the aircraft's systems and operational requirements, ensuring they are well-prepared for flight. It emphasizes the importance of understanding the Dakota's unique features, such as its engine specifications, fuel system, electrical system, and emergency procedures, to enhance safety and efficiency during operations.

  • The Dakota PA-28-236 has a Lycoming O-540 engine with 235 HP.
  • Total fuel capacity is 77 US gallons, with 72 gallons usable.
  • Normal oil pressure range is 25-100 PSI; maximum oil temperature is 245°F.
  • Maximum takeoff weight is 3000 lbs; maximum ramp weight is 3011 lbs.
  • Key airspeeds include Vr at 60-65 KIAS and Vx at 73 KIAS.

Document

Source

Originally published by www.blueskyaa.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

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Document details

Type
Systems Description
Year
1979
Pages
6
File size
285 KB
Publisher
www.blueskyaa.com
Documentation completeness
4/7

Most owners only have the POH. Here's the essential set for the Piper PA-28 Dakota.

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In this document

General Information

The Dakota PA-28-236 is certified for IFR operations, and it features a Lycoming O-540 engine producing 235 HP. The static RPM is 2400 RPM, and the engine requires 12 quarts of oil, with a minimum operational level of 9 quarts. The maximum engine oil operating temperature is 245°F, while the normal oil pressure range is between 25-100 PSI.

Fuel System

The Dakota uses 100LL fuel, with a total fuel capacity of 77 US gallons, of which 72 gallons are usable. Each wing holds 38.5 gallons of fuel. The aircraft has two fuel pumps: one engine-driven and one electrically operated. Fuel pressure should be maintained between 0.5-8 PSI.

Electrical System

The Dakota is equipped with a 12-volt battery and a 14-volt, 60A alternator. The maximum continuous load on the electrical system is 30 amps. If the alternator fails, the battery will support essential electronics for a limited time.

Landing Gear

The Dakota features a tricycle fixed gear system. Proper tire pressures are 29 PSI for the nose gear and 35-40 PSI for the main gear. The aircraft requires specific strut exposure of 3.25 inches for the nose and 4.5 inches for the mains.

Airspeeds and Performance

Key airspeeds for the Dakota include Vr at 60-65 KIAS, Vx at 73 KIAS, and Vy at 85 KIAS. The maximum demonstrated crosswind component is 17 knots, and the maximum takeoff weight is 3000 lbs.

Emergency Procedures

In the event of engine roughness, pilots should check carb heat, fuel pump settings, and mixture adjustments. For off-field landings, it is crucial to turn off the fuel pump and switch off the master and ignition before landing.

Safety notes

  • Ensure the fuel pump is on during landing to prevent fuel starvation.
  • Monitor oil pressure closely; a drop with stable temperatures may indicate a faulty gauge.

Full document text

Blue Sky Aviation New Aircraft Checkout Dakota PA-28-236 A brief history: Piper has introduced so many variants of the original (1962) PA-28 design that it’s hard to keep track of which Cherokee is which. Our “PA-28” is actually the PA-28-236, or more commonly known as the Dakota. The Dakota was introduced in 1979 as a new model, but it was really the second generation of the PA-28-235 Pathfinder. In fact, the Dakota and Pathfinder were almost identical in every way but one: Piper decided that a new tapered wing would lessen induced drag when compared to the old “Hershey bar” wing. This new tapered wing design gave the Dakota a number of distinct advantages over its predecessor; it was faster, carried more fuel, and even had better climb performance too. Our Dakota is actually a first-year model but has been improved substantially since it flew off the factory line: a G3X, a GTN 750, and a GFC500 autopilot system. 1 Like previous checkouts, we have prepared an “open book” questionnaire as a way to help you get familiar with the Dakota. In addition to this document, you should know that all required documents, including both the POH and manuals, are on the Blue Sky website. Please bring this completed document to your checkout session with your CFI. Feel free to discuss any questions or concerns you may have during your checkout. Being prepared will expedite the checkout (read: more flying, less talking). Your first check out in the Dakota is for VFR purposes only so that we can facilitate getting everyone checked quickly. You will find the avionics quite similar to the Skylane. And you’ll find it a little heavier on the controls than the Archer. It will be up to you and your instructor to assess the need for any IFR training based on your currency and familiarity with the Dakota’s systems. The following set of questions is meant to be practical - all the information contained within is to help you be a better, safer pilot. New planes always present various challenges, and the Dakota is no different. Here’s to a great addition to our fleet!! Pilot______________________________ Date_____________ General: 1. Is the Dakota certified for IFR operations? YES/NO 2. Let’s say you want to get your CFI cert. and you need one hour of spin training. 3. Can you do that in the Dakota? YES/NO 4. What engine is in the Dakota? Lycoming O-540 and 235HP. 5. What is static RPM? 2400 RPM 6. Do you need a high-performance endorsement to fly a Dakota? YES. 7. How many quarts of oil does the engine take? 12 quarts 8. What is the minimum number of quarts of oil for normal use? 9 quarts 9. What is the minimum number of quarts in an O-540? 2.75 quarts! (Section 8.19) Note: That’s NOT the club minimum. 10. What is the maximum engine oil operating temperature? 245 degrees F. 11. Note: Don’t confuse this with CHT; this is OIL temp. 12. What is the normal engine oil pressure range? 25-100 PSI 13. What is the maximum cylinder head temperature (CHT) of the O-540? 500 F 14. What are considered good CHTs during most operations of the O-540? <= 400 F degrees Fuel System: 2 13. What is the normal fuel pressure range? 0.5-8 PSI 14. What kind of fuel does the Dakota take? 100LL 15. What color is the fuel normally? Blue 16. What is the total fuel capacity? 77 US Gallons 17. How much of that is usable? 72 US gallons 18. How much fuel per wing? 38.5 US gallons 19. How many fuel drains are there and where are they located? Three drains, two located in the inboard rear corner of the wing and another one from the cowling at the lower left front corner of the firewall. 20. How many gallons of fuel do you have per wing if you see fuel at the bottom of the indicator tab? 25 gallons (Section 7.15) 21. How many fuel pumps does the Dakota have? Two, one engine-driven and one electrically operated by a rocker switch on the switch panel. 22. Does the Dakota have a BOTH detent on the fuel selector? No, it has OFF, LEFT, and RIGHT. 23. When changing fuel tanks what should you do first? The fuel pump should be turned ON and fuel pressure should be verified before turning the fuel pump OFF. Electrical System: 24. What kind of battery does the Dakota have? 12-volt 25. What kind of alternator does it have? 14-volt, 60A 26. What does the ammeter display? The load placed on the alternator, or what the battery needs to stay charged. 27. What is the maximum continuous load? 30 amps (Section 7.17) 28. If the alternator dies in flight, do you immediately lose all electronics? No, the battery will be drained after a while (depending on load) and there are internal batteries for each G5 that last ~4 hours each. 29. If you see the ALT annunciation during flight, what is the first thing you should check? The ALT circuit breaker to see if it has tripped. Check battery voltage and load on ammeter. 30. If the ALT circuit breaker is tripped, what should you do? This is a high load breaker. It tripped for a reason. You should carefully evaluate whether it is required for continued flight before resetting. Landing Gear: 31. What kind of landing gear does the Dakota have? Tricycle fixed gear 32. What are proper tire pressures? The nose gear tire should take 29 PSI and the mains should be between 35-40 PSI for normal operation. (Section 8.23). 33. What is proper strut exposure? There should be 3.25 inches of clearance for the nose and 4.5 inches for the mains. 34. Can you put air in the tire as part of routine maintenance under Part 43? YES 35. Can you adjust the struts? NO, needs to be placed on jacks first. Flaps: 36. Does the Dakota have electrically controlled flaps? NO 37. How do you operate the flaps? There is a bar on the floor that you pull up which has a spring lock to keep it in place. 38. What flap positions can be selected? 10, 25, and 40 degrees 39. Can you use the flaps as a step? YES but they have to be in the full up position. The flaps will not support any kind of step load unless they are completely retracted. (Section 7.13)

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40. How do you retract the flaps? Pull up on the lever to disengage the spring lock and gently let the lever return back to the floor position. Pitot-Static System: 41. Where is the static port located? There are two, one on each side of the aft fuselage. (Section 7.23) 42. Where is the alt-static port located? Left side of the instrument panel 43. When using alt-static air, what else should you do? The storm window and cabin vents should be closed and the cabin heater and defroster should be on when using alternate static air. (Section 7.23) 44. What is the accuracy of the alt-static air? Accuracy should be generally good, and within 50 feet. (Section 7.23) 45. Where is the pitot tube? Under the left wing 46. Where are the pitot and static line drains? Under the left wing, near where the spar and wing attach. Drain during preflight. (Figure 7-17) Airspeeds: 47. Vr = ? 60-65 KIAS 48. Vx = ? 73 KIAS 49. Vy = ? 85 KIAS 50. Va = ? 124 KIAS at max gross, 96 KIAS at a little over half that 51. Vne = ? 173 KIAS 52. Vg = ? 85 KIAS at max gross, notice that Vy and Vg are equal. 53. Vs0 = ? 56 KIAS 54. Vs1 = ? 65 KIAS 55. Vfe = ? 102 KIAS, not 110 like the Skyhawk! 56. Vref = ? 72 KIAS with 40 degrees of flaps 57. Maximum demonstrated cross = ? 17 knots Weight and Balance: 58. Maximum ramp weight? 3011 lbs. 59. Maximum takeoff weight? 3000 lbs. 60. Maximum landoff weight? 3000 lbs. 61. Maximum baggage weight? 200 lbs. 62. What could happen if you land over the maximum takeoff weight? You could damage the landing gear. Normal Procedures: 63. What position should the mixture knob be set to during a normal cold start? Full RICH 64. What should you immediately check after the engine starts? Oil pressure 65. What is the maximum differential you should see between mags during your run- up? 175 RPM max diff/50 RPM drop both sides, note: the max differential is more important than any single RPM drop. 66. When phases of flight should the fuel pump be turned on? Starting, takeoff, and landing, and switching tanks. 67. Why is it important to have the fuel pump on during landing? Because the Dakota is a low-engine aircraft and on a go around, particularly with a high- angle of attack, fuel starvation is a concern. 68. Do you need flaps for take-off? No, but you can use 10 or 25 degrees if needed or desired. 69. How would you perform a short field take-off? Flaps 25 degrees, accelerate to 50-60 KIAS, Vx initial climb past the obstacle and then Vy. 70. Any differences with a soft field take-off? Same settings as short field but use typical soft field technique. 71. After reducing power on a descent, what should you turn on during a descent and why? Carb heat to avoid potential carburetor icing. 72. During landings, what side should the fuel tank be set to? Ensure the fuel tank is on the most full side. Emergency Procedures: 73. You are flying along and suddenly the engine is running rough, what are a few things you can do to diagnose quickly? Carb heat on, fuel pump on, mixture full rich, try another fuel tank, try each mag. 74. If you suspect you have carb ice, should you leave the carb heat on? Turn on the carb heat, leave it on until the roughness clears, then climb or descend to get out of icing conditions and turn carb heat off. 75. If you need to make an off field landing, what are some of the things you would do to prepare the Dakota for landing? Fuel pump off, fuel switch off, master off, ignition off, mixture idle-cut off 76. If you see oil pressure going down but oil temps staying the same, what could that mean? It could mean you have a faulty oil pressure gauge but you can’t be sure. Land at the nearest suitable airport and have it checked.