All posts tagged 'IFR'

3 Rare Symbols on Instrument Approach Charts, and Why You Should Know Them

Alright guys, I'm studying for CFII lately (which by the way I hate studying for check rides) and have gotten to the stage of practicing teaching approach charts.

I noticed in doing practice group sessions with students that everyone knows how to read the basic things like localizer frequency, final approach fix, missed approach instructions etc...the IMPORTANT stuff. The meat and potatoes of the approach. But you HAVE to know how to read EVERYTHING on that approach chart to be a good instrument pilot. 

Another reason you need to know how to break that approach chart down is because it factors into your plane performance-can you accept the approach along with missed approach instructions? This is something to keep in mind as well with departures. In instrument training you're likely flying something like a Cessna 172 where you don't usually accept SID's or even look at any "complicated" (so to speak) approach charts. So let's talk about 3 different symbols on approach charts that I find are commonly not taught/known.

1) VDP

VDP stands for visual descent point. It's not found on ALL approach charts but more instead on straight-in approaches to specific runways. If the approach chart has one, what this means is you should not descend below the MDA prior to this point. 

To be specific, it's the bold V circled on this chart from Telluride, Colorado. Check out the terrain in this area...might be important to know what this V means!

2) Maltese Cross

The circled "lightning bolt" pointing to ROVEZ on the RNAV 30 for KBPT is the maltese cross for this approach. It indicates the final approach fix on a nonprecision approach. Its purpose is to point out where the final approach segment begins. 

3) Cold Weather Corrections

Cold weather corrections are important to know to ensure that you're flying at the corrected altitude. If the system isn't operating to automatically compute this then it has to be done by hand by the corrections chart on page 5-19 of the Digital Terminal Procedures Supplement (pictured beneath the approach chart). 

In addition to this post, you may see some new blogs written on our blog page by our newest writer Nicole Lund! Nicole wowed us last year with an awesome scholarship application and proceeded to have very well written blog posts throughout the year with interesting topics & experiences. One of her craziest stories is she had an engine failure on a solo xc as a student pilot and had to land in a nearby field. A few days later, she was back flying and so was the plane because she was able to set it down without any damage (except for whatever caused the failure). Imagine getting that phone call as an instructor....

SO congrats Nicole and welcome to the team! 

Thanks for reading, hopefully these charts help point out some rare symbols for you to stay proficient on!

Questions or comments? Post below! 

5 Winter Weather Hazards Pilots Should Pay Attention To


Photo: Scott Wright CCBY-SA 2.0

Winter has arrived early for some, with snow and ice abundant in northern parts of the country already! Cold-weather flying can bring smooth, calm air and great performance, but it can also bring ice and slick runways. If you’re an avid year-round flyer, then you’re probably familiar with the hazards associated with flying in the winter: cold engine starts, frost on the wings, structural icing, and slippery runways. Winter operations include preheating the aircraft, getting the frost off the wings before takeoff and avoiding icing conditions in aircraft that aren't approved for flight into known icing. There are even hazards involved with de-icing! Winter flying is enjoyable, as long as you stay ahead of these winter weather hazards:

  1. Cold engines
    If extremely cold temperatures, it’s wise to preheat the engine before flying. Besides sluggish oil, frost can build up on spark plugs and freezing cold temperatures can also cause instruments to freeze or be sluggish – all bad news for the airplane. Engine crankcases should also be inspected during the preflight to ensure there’s no icing due to vapors condensing.
  2. Frost
    Frost and ice found on your aircraft during the preflight can be removed. Frost and ice found during takeoff, not so much. Even a tiny bit of frost on the airframe can cause a significant loss of lift and the aircraft might stall at a lower-than-usual angle of attack. Never take off with frost on the aircraft!
  3. Icing

    As winter arrives and the freezing level gets lower and lower, pilots need to be prepared for structural icing. Without a properly equipped aircraft, pilots should stay out of areas where icing is forecast or likely. But sometimes icing occurs without notice, and it can occur rapidly. To stay out of trouble, make sure you always have an escape plan if flying in the clouds in cold weather. Ice build-up on the airframe causes loss of lift, increased drag and increased weight.

    If you enter icing conditions in an ill-equipped aircraft, your choices are to climb, descend or turn around. Much of the time, small aircraft will not have the performance to climb through a cloud layer, which is why it’s important to be able to gauge aircraft performance quickly if it’s reduced. It’s also very important to know where the cloud layers are. A pilot in a small airplane won’t want to try to climb if the cloud tops are at 30,000 feet. But if it’s a thin layer of clouds with, say, the base at 6,000 and the top at 7,000, you should be able to climb out of the icing conditions and get above the clouds.

    In most cases, you’ll want to turn around or descend below the clouds. And don’t forget that you can enlist the help of ATC and other weather services if you need assistance getting out of icing conditions.

  4. Runway condition
    During the winter, runways can be slick from frost or icy conditions, and they can also be wet from aircraft operating and winter vehicles removing snow. Know your aircraft’s performance and limitations with wet, snow-covered or icy runways, and make sure you give yourself plenty of extra landing space. Wet runways really do reduce landing performance.
  5. De-icing hazards
    It should go without saying that credit cards aren’t recommended for scraping ice off airplane windshields. But every year, I hear a story about this happening. Get the ice off the recommended way: A soft brush made for aircraft can get the snow off, and de-icing fluid can melt the rest. But de-icing procedures can be hazardous if you don’t know what you’re doing!

    Remember that melted ice can refreeze quickly, and you should always check flight controls and flaps, as well as hinges after de-icing, where water can drip and refreeze.

    De-icing fluid should always be handled with care. A quick check of wind direction before spraying will ensure you don't get Propylene Glycol in your eyes!

    Finally, make sure you’re using an appropriate chemical for your aircraft, and follow local airport procedures for de-icing areas and safety protocols.

Have your own winter flying tips to share? Let us know!

7 Reasons an Instrument Rating Will Make You a Better Pilot


Photo: N. Tackaberry/Flickr-CC BY-ND 2.0
Getting an instrument rating means you’ll be able to fly in the clouds and you won’t be stuck on the ground as much because of bad weather. But an IFR rating also comes with a few other advantages. Here’s why getting an instrument rating will make you a better pilot:

  1. You’ll become more accurate.
    There’s no doubt that accuracy improves with instrument flight. In order to remain safe while in the clouds, you have to stay on your altitude and heading. Deviations become much more of a safety hazard when you can’t see the ground below you or other aircraft flying around you. During your IFR training, you learn to fly more precisely, staying on your assigned altitude, heading and airspeed, or making exact pitch and power changes for, say, a precise 500 foot-per-minute climb. These skills will transfer over to your VFR flying, too.

  2. Your preflight planning will be better.
    Preflight planning is always important, but when you introduce low ceilings and fog into the equation, planning is done with a whole new outlook. IFR flight presents new challenges like icing hazards, holding procedures and traffic delays, and it’s more important than ever to be prepared for fuel stops, flight plan deviations and alternates.

  3. You’ll learn more about your airplane’s instruments and technology in general.
    In-depth familiarization with your aircraft’s instruments is one of the challenges of the IFR rating. You’ll not only need to know how these instruments work, but you’ll become familiar with what to do in case of instrument failure. The extra knowledge of autopilot systems and GPS technology will come in handy for flying in different environments, both VFR and IFR.

  4. You’ll always be ‘two steps ahead’.
    Any instrument student knows that part of IFR training is transforming your mindset from real-time flying to being at least two steps ahead of the airplane. Being ahead of the airplane is necessary for instrument flight, as there are numerous things going on and you’ll need to react quickly. Planning for the next two or three steps will become second-nature to you, and before you know it, you’ll be using this mental trick all the time – even for non-aviation tasks!

  5. You’ll be more prepared for inadvertent flight into IMC.
    Flying in the clouds is safe when it’s predictable, and when on an IFR flight plan. But there are times when you might find yourself in less-than-VFR conditions without intending to be, like at night, when the clouds roll in sooner than predicted, or if it’s tough to see the horizon in rain or hazy conditions. An instrument rating will greatly increase your chances of remaining in control of the aircraft should you encounter an inadvertent flight into IMC condition.

  6. You’ll be better at finding traffic in the area.
    As a VFR pilot unfamiliar with IFR operations, it’s difficult to know where exactly another aircraft is when the pilot reports "localizer inbound" or "on the 7 mile arc." With an instrument rating, you’ll finally be aware of the exact locations of all of these other aircraft in the local area, improving your situational awareness and collision avoidance capabilities.

  7. You’ll become more skilled at noticing and predicting the weather.
    IFR training gives pilots a really thorough look at weather theory and weather reports. As you gain experience flying in IFR conditions, you’ll get much better at recognizing hazardous weather like icing, thunderstorm activity and frontal passages. This proves to be valuable knowledge to have during any flight, of course, and as a bonus you might also become the go-to guy for weather reports and forecasts among your family and friends.

Are You Prepared for Instrument Failure in IMC?


Photo: Wikimedia/Meggar

Autumn is in full swing, and the cooler nights tend to make morning fog a common occurrence in many places. While fog might not be a problem for you if you are IFR-rated and current, it’s nevertheless a good time to review your emergency procedures – like instrument failures and partial panel procedures.

A failure of any instrument in the cockpit of your airplane is difficult enough to deal with during a VFR flight, but the proper procedures after an instrument failure in IMC can mean the difference between life and death. While we tend to remain "current" by flying IFR flight plans and instrument approaches on a daily or weekly basis, unless you work for a company that requires it, you probably don’t practice instrument failures or partial panel procedures enough.

Are you ready for an instrument failure in instrument conditions? After training your eyes and brain to "trust your instruments," can you immediately recognize instrument errors and reverse that deep-rooted feeling that your instruments must be correct?

Identifying instrument failures seems like an easy enough task – after all, if an instrument is behaving erratically, there’s a good chance it’s malfunctioning - but it’s difficult for our brains to determine exactly what’s happening at first glance when an instrument fails, and sometimes the failure occurs slowly, such as the slow icing over of a pitot tube. And that’s only the first part of the emergency. The second part is responding correctly. While in the clouds without correct instrument indications, knowing which way is up can be puzzling to even the most experienced pilots. Here’s a quick review about how instruments react to common types of failures in many light aircraft.

***This is not a substitute for instruction. Please consult your aircraft’s POH for emergency procedures specific to your airplane! ***

Pitot-Static System Failure:
A problem with the static system will appear on the airspeed indicator, altimeter or vertical speed indicator (VSI), or a combination of the three.

  • Blocked Pitot Tube: A pitot tube blocked with insects is a common culprit of erroneous airspeed indications. This type of blockage might be noticed during takeoff, when the airspeed doesn’t increase as usual. With a total pitot tube blockage, the airspeed will read ‘0’. But the pitot tube can also be blocked during flight with ice or heavy rain, and as ice accumulates slowly over the pitot tube, the airspeed indicator will show a slow decrease in airspeed, maybe not even noticeable at first.

    Since the pitot tube is used just for the airspeed indicator, a blocked pitot tube will not affect the altimeter or VSI.

  • Blocked Static Port: A blocked static port isn’t too much of a problem if the aircraft is equipped with an alternate static source (many are). But without alternate air, a blocked static source will cause the airspeed indicator to act as a reverse altimeter, showing an increase in airspeed during a descent and a decrease in airspeed during a climb.

    With a blocked static port, the altimeter will freeze, showing the last altitude recorded before the blockage occurred, and the VSI will indicate ‘0’.

  • Pitot and Static Blockage: If both the pitot tube and static system are blocked, the airspeed indicator will act like an altimeter, showing an increase in airspeed when climbing and a decrease in airspeed while descending.

Gyroscopic System Failure:
There’s a reason the vacuum gage is checked during the engine run-up. It’s because two of the three commonly used gyroscopic instruments run on a vacuum-driven pump, and if these instruments fail, flying can be pretty dangerous.

The gyroscopic instruments typically include the turn coordinator, heading indicator and attitude indicator. The heading indicator and attitude indicator are vacuum-drive most of the time, so a vacuum failure or loss of suction will cause the attitude and heading indicators to ne unreliable.

Many commonly used turn coordinators are electrically driven (done for redundancy and as a backup to the vacuum system), and will fail along with an electrical failure.

A pitot-static or gyroscopic failure can be difficult to diagnose and confirm at first. The trick is to think about a failed instrument on a systemic level by determining which, if any, other instruments are also affected. If your airspeed seems off, check your other instruments. If they are also indicating erroneously, than you can bet there’s a pitot and static failure. If only the airspeed is incorrect you can rest assured the pitot tube alone is the culprit. By cross-checking often and making sure all your instruments agree with each other, you’ll be able to determine which are malfunctioning and take appropriate action. What’s the appropriate action? Covering up the inaccurate instruments and converting to a new insrtument scan that will keep you alive and allow you to land safely.

In any case, the quick and proper diagnosis of an instrument or system failure will turn an emergency into an inconvenience (although you should always declare an emergency when the situation warrants). A good pilot is always prepared, and preparation in this case comes with consistent practice, so be sure to brush up on your partial panel procedures often!

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