Hi Readers: In my aviation experience I've found that certain definitions (FAA regulations, for instance) - acronyms and phrases - indicate a definite meaning, but relate to several separate operations. Here is a beginning list, covering a few basics, and items relating pretty much to complete flight. There are other definitions that will be covered, periodically, in future blogs. In fact, most of them are covered in the Pilot/Controller Glossary of the Aeronautical Information Manual (AIM).
Basics:
Ceiling - Height of the lowest layer of clouds or obscuration phenomena that is reported as
broken, overcast, or as obscuration.
Visibility - In units of distance to see and identify prominent unlighted object by day and
lighted objects at night, in statute miles.
Track - The actual flight path of the aircraft over the surface of the earth.
Tailwind - Any wind greater than 90 degrees to the longitudinal axis (magnetic) of the
runway.
Crosswind Component - The wind component measured in knots at 90 degrees to the
longitudinal axis of the runway.
True Airspeed - Calibrated airspeed corrected for altitude and temperature. True airspeed
increases with altitude.
Cardinal Altitudes - Odd or even thousand-foot altitudes or flight levels.
Weather:
Significant Weather - SIGMETS - severe and extreme turbulence, severe icing, widespread
dust or sandstorm that will reduce visibility to less than 3 miles.
Marginal Weather - Less than VFR conditions.
Hazardous Weather - Summary of SIGMETS and PIREPS such as thunderstorms, low
ceilings and visibilities not included in Hazardous Advisories.
Climb and VFR Flight:
Cleared As Filed - Aircraft is cleared to proceed IAW the route of flight filed in a flight
plan - does not include the altitude, DP, or DP transition.
Climbout - That portion of flight between takeoff and the initial cruising altitude.
Climb To VFR - ATC authorization for an aircraft to climb to VFR conditions, within certain
class surface areas when the only weather limitation is restricted visibility
- must remain clear of clouds.
VFR Not Recommended - An advisory by a FSS to a pilot during preflight or an inflight
weather briefing - when current and forecast conditions are at
or below VFR minimums.
Visual Meteorological Conditions - Weather conditions in terms of visibility, distance from
clouds, and ceiling equal to or better than minimums.
Special VFR Conditions - Conditions that are less than for basic VFR - permitted flight
under VFR class surface areas.
Approach and Landing:
Visual Approach - On an IFR flight plan, which authorizes the pilot to proceed visually -
ceiling 1,000' and visibility 3 miles.
Contact Approach - By visual reference, on an IFR flight plan, only by request from the
pilot, and when the ground visibility is at least 1 mile.
Straight-In Approach - Can be either VFR or IFR - visually and clear of clouds.
Runway Threshold - Relates to runway markings for visual, precision, and nonprecision
approaches, including a displaced threshold.
Touchdown Zone - The first 3,000' of runway beginning at the threshold.
Terminal Area - A general term used to describe airspace in which Approach Control
provides service to airport traffic.
Thanks for listening. R.S.
Showing posts with label ceiling. Show all posts
Showing posts with label ceiling. Show all posts
Friday, January 25, 2008
Sunday, October 14, 2007
September 2007 Aircraft Accidents/Incidents
Hi Readers: Its time to review the September Accident/Incidents as reported by NTSB. There were 98 accidents and 2 incidents (7 non-U.S. accidents) of which 36 were fatal accidents accounting for 134 fatalities.
One incident was a Part 121 Air Carrier DC-9 engine fire warning in flight, and the other was a night VFR incident in which the Tower Controller instructed a Part 135 Lear Jet pilot to taxi into position and hold on R19R at Potomac airport in Washington D.C. Runway 19R was actually closed and the runway lights were off. The runway closure was advertised on ATIS and the closure was placed on the ground radar display in the Tower. The Tower Controller then cleared the pilot for takeoff. The FAA classified the incident as an operational error.
The September accidents, particularly the fatal accidents, show a conglomeration of accident types and indicated probable causes. There were 8 takeoff accidents (3 engine failures, 5 stalls or failure to clear trees and terrain); 9 loss of control and/or maneuvering at low altitude, including spin-ins; a collision of 2 airplanes, and a loss of control of one airplane, during the Reno, Nevada Air Races; one inflight collision with mountains; one flying into a thunderstorm and a crash shedding airplane parts; one formation-demonstration crash; 3 unknowns; one helicopter tail boom and rotor failure inflight; one where the passenger walked into the main rotor; and the accident involving Steve Fossett (never found). There was one GPS approach accident - a second attempt in a 100 ft overcast, with 1/4 mile visibility, and a zero temperature-dewpoint spread, resulting in 3 fatalities.
One fatality, and one serious injury, U.S. Customs accident, practising touch-an-go maneuvers, attempting a full-flap, short field landing, involved dropping the airplane in to the runway (10-12 ft.) and a bounce airborne, then a drift to the right of the runway centerline. The pilot applied power, resulting in a 30 to 40 ft pitchup and stall, further resulting in impact with terrain in a nose-low attitude and following fire. ( A typical example of how not to land an airplane)
One accident indicated an overload of the airplane on takeoff, resulting in 5 fatalities.
In general, we must conclude that the sum total of the accidents reflect carelessness, failure to follow the rules, poor decisions, and poor judgment. These accidents show deviation from safety of flight, and the type of accidents we would like to prevent. Also, unfortuneately, the type of accidents most likely to result in fatalities.
The poor judgment accidents continue for lack of knowledge and training. The poor planning and poor decision accidents we can correct, particularly those accidents involving X-C flight and weather. The carelessness and recklessness - Pilots must follow the rules.
We can attack the safety aspects of flying by separations, such as: 1. Local and X-C flight; 2. Pilot experience - flight hours, certificates, and proficiency issues; 3. Pilot - aircraft type certification; 4. VFR - IFR flying; 5.Rules and Regulations; 6. Aeronautical knowledge.
Supposedly we are doing this now - so what are we doing wrong?
Thanks for listening. R.S.
One incident was a Part 121 Air Carrier DC-9 engine fire warning in flight, and the other was a night VFR incident in which the Tower Controller instructed a Part 135 Lear Jet pilot to taxi into position and hold on R19R at Potomac airport in Washington D.C. Runway 19R was actually closed and the runway lights were off. The runway closure was advertised on ATIS and the closure was placed on the ground radar display in the Tower. The Tower Controller then cleared the pilot for takeoff. The FAA classified the incident as an operational error.
The September accidents, particularly the fatal accidents, show a conglomeration of accident types and indicated probable causes. There were 8 takeoff accidents (3 engine failures, 5 stalls or failure to clear trees and terrain); 9 loss of control and/or maneuvering at low altitude, including spin-ins; a collision of 2 airplanes, and a loss of control of one airplane, during the Reno, Nevada Air Races; one inflight collision with mountains; one flying into a thunderstorm and a crash shedding airplane parts; one formation-demonstration crash; 3 unknowns; one helicopter tail boom and rotor failure inflight; one where the passenger walked into the main rotor; and the accident involving Steve Fossett (never found). There was one GPS approach accident - a second attempt in a 100 ft overcast, with 1/4 mile visibility, and a zero temperature-dewpoint spread, resulting in 3 fatalities.
One fatality, and one serious injury, U.S. Customs accident, practising touch-an-go maneuvers, attempting a full-flap, short field landing, involved dropping the airplane in to the runway (10-12 ft.) and a bounce airborne, then a drift to the right of the runway centerline. The pilot applied power, resulting in a 30 to 40 ft pitchup and stall, further resulting in impact with terrain in a nose-low attitude and following fire. ( A typical example of how not to land an airplane)
One accident indicated an overload of the airplane on takeoff, resulting in 5 fatalities.
In general, we must conclude that the sum total of the accidents reflect carelessness, failure to follow the rules, poor decisions, and poor judgment. These accidents show deviation from safety of flight, and the type of accidents we would like to prevent. Also, unfortuneately, the type of accidents most likely to result in fatalities.
The poor judgment accidents continue for lack of knowledge and training. The poor planning and poor decision accidents we can correct, particularly those accidents involving X-C flight and weather. The carelessness and recklessness - Pilots must follow the rules.
We can attack the safety aspects of flying by separations, such as: 1. Local and X-C flight; 2. Pilot experience - flight hours, certificates, and proficiency issues; 3. Pilot - aircraft type certification; 4. VFR - IFR flying; 5.Rules and Regulations; 6. Aeronautical knowledge.
Supposedly we are doing this now - so what are we doing wrong?
Thanks for listening. R.S.
Sunday, June 3, 2007
Ceiling and Visibility
Ceiling and visibility are two basic weather elements which must be considered in all flying beginning with your flight planning. Normally we don't give the two elements much thought. We look at the sky - it's either cllear or cloudy. And we look out and around to see how far we can see objects. But for flying, the broad perspective must be narrowed to specific judgments.
The FAA's definition of ceiling is "the height above the earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as broken, overcast, obscuration, and not classified as thin or partial". Pretty wordy and a little confusing, yes?
Well, let's get practical - if you cannot see clouds in the sky or you have something like fog or haze, you have either no ceiling at all or you have ceiling zero, depending on whether the condition is thin or heavy in obscuration.
Weather Observers classify clouds 3/10 or less as scattered, 6/10 as cloudy or a ceiling, 10/10 as overcast. And, of course, heavy fog would be obscuration or ceiling zero.
Now visibility is another matter. We usually think of seeing objects in terms of miles (statute), say 1/4 mile, 1/2 mile, 1/ mile, 3 miles, etc., a matter of distance judgment - relating much to visual acuity used in connection with takeoff, landing, and clearances, and VFR and IFR flight. In fact, ceiling and visibility appears as the first pair of elements used in our flight planning.
As stated (all too simply) in the FARs (Federal Air Regulations), IFR flight is weather conditions below the minimums for flight under VFR conditions.
In any case, to the pilot ceiling means dealing with clouds, sky cover, at what altitudes, and their movement over time. Visibility relates to all kinds of weather conditions - rain, snow, fog, smoke, and haze in connection with all phases of flight and appears perhaps as the first defining factor in planning whether you fly VFR or IFR.
The FAA's definition of ceiling is "the height above the earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as broken, overcast, obscuration, and not classified as thin or partial". Pretty wordy and a little confusing, yes?
Well, let's get practical - if you cannot see clouds in the sky or you have something like fog or haze, you have either no ceiling at all or you have ceiling zero, depending on whether the condition is thin or heavy in obscuration.
Weather Observers classify clouds 3/10 or less as scattered, 6/10 as cloudy or a ceiling, 10/10 as overcast. And, of course, heavy fog would be obscuration or ceiling zero.
Now visibility is another matter. We usually think of seeing objects in terms of miles (statute), say 1/4 mile, 1/2 mile, 1/ mile, 3 miles, etc., a matter of distance judgment - relating much to visual acuity used in connection with takeoff, landing, and clearances, and VFR and IFR flight. In fact, ceiling and visibility appears as the first pair of elements used in our flight planning.
As stated (all too simply) in the FARs (Federal Air Regulations), IFR flight is weather conditions below the minimums for flight under VFR conditions.
In any case, to the pilot ceiling means dealing with clouds, sky cover, at what altitudes, and their movement over time. Visibility relates to all kinds of weather conditions - rain, snow, fog, smoke, and haze in connection with all phases of flight and appears perhaps as the first defining factor in planning whether you fly VFR or IFR.
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