How Do You Clean A Low Speed Jet On A 20hp. Tohatsu Outboard
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Pete has been flying aircraft for the terminal 20 years. He has flown everything from calorie-free piston shipping up to heavy jets every bit both First Officer and Captain. He'southward currently enjoying life flight the Airbus A330 for a major international airline.
What is a squawk code?
A "squawk lawmaking" is a code assigned past Air Traffic Command that pilots enter into their transponder that identifies the aircraft on the controllers screen. Squawk codes are 4 digit numbers with each digit in the range of 0 to 7, and correspond to a particular flying. When a particular flight is identified by a squawk code, the air traffic controller volition be able to run across certain details about the flight on their screen, such as: callsign, speed, altitude and assigned distance. Other information may also be available including aircraft routing, wake category, aircraft type etc.
What does Squawking 7700 mean?
7700 is a squawk code that is reserved for emergency situations and immediately alerts Air Traffic Control (ATC) and other units that the aircraft squawking 7700 is in distress. It may be assigned past Air Traffic Control or the pilots may decide to enter it into their transponder themselves.
What are other squawk codes that are reserved?
Some ATC squawk codes are resaved for sure situations, such as:
| Squawk Code | Meaning |
| k | Conspicuity lawmaking – ADS-B/Manner-S flight number used for identification |
| 1200 | Visual Flight Rules (VFR) – U.South. and Canada |
| 2000 | Used when entering SSR airspace from not-SSR airspace. due east.1000. used when exiting Oceanic Airspace before a squawk is assigned by ATC |
| 4440-4452 | Operations above FL600 (NASA, SR-71,U-2) |
| 7000 | Visual Flying Rules (VFR) – ICAO |
| 7001 | Sudden military climb-out from low-level operations (U.K.) |
| 7004 | Aerobatic/Display operations |
| 7400 | Unmanned Aircraft Organization (UAS) Lost Communication Link |
| 7500 | Unlawful interference (i.eastward. hijack) |
| 7600 | Radio communications failure |
| 7700 | Emergency |
| 7777 | DOD interceptor aircraft on active air-defence missions |
When would pilots squawk 7700?
Setting a squawk of 7700 signifies a MAYDAY situation and alerts Air Traffic Command and other units that may be airborne (SAR, AWACS etc.) that the aircraft has an emergency and may non be able to comply with ATC clearances. For example, a sudden loss of motel pressurization may result in an emergency descent to a lower level – usually 10,000′, or the MSA (Minimum Safety Distance) if higher.
What happens when a airplane pilot squawks 7700?
When a pilot enters 7700 into the transponder and aural alarm will exist triggered at the Air Traffic Controllers station. Likewise the "tag" (showing the aircrafts callsign) will wink with "EM" for emergency. The alert will show upward on all sectors that are inside range, regardless of the altitude limit sit on the individual scope. This is to alert nearby sectors to the emergency.
Related: Aircraft Transponders Explained
If there is no communication from the aircraft you tin expect ATC to attempt to brand contact. If the coiffure declare "MAYDAY MAYDAY MAYDAY" oftentimes the first answer from ATC is "Re-create your MAYDAY", or something to that effect. Controllers are aware that then when a pilot declares an emergency their workload will increase essentially.
Pilots are taught to prioritise flying the aircraft higher up all else.
one. Aviate
2. Navigate
3. Communicate
Aviate Navigate Communicate
Aviate
Fly the aircraft. Wing-the-aircraft.
There have been too many accidents over the years where perfectly serviceable aircraft crashed considering the pilots became distracted by a pocket-size technical trouble.
In 1972 a Lockheed Tristar on arroyo to Miami went around after the nosegear failed to betoken down and locked. The coiffure got distracted trying to fix the problem (likely but a blown bulb) and the aircraft impacted the Florida Everglades with a loss of 101 lives. Aviation Condom Network: Everglages L-1011 crash.
Fly. The. Aircraft. There have been a lot of advancements in coiffure training since this and other accidents. Every 6 months crews are subjected to a number of training and checking days in the simulator where they are subjected to a avalanche of failures: engine failures, rejected take offs, go-arounds, fires etc.
In this training and in not-normal operations, the importance of "assigning command" of the aircraft to i coiffure member is critical.
Often one of the pilots will concentrate solely on flying the shipping while the other pilot exams the aircraft systems using the ECAM/EICAS, refers to the QRH (Quick Reference Handbook), completes memory items and any other tasks to ensure the safety of the aircraft.
Related: A Guide to the Quick Reference Handbook (QRH)
Navigate
In one case the aircraft is secure the next footstep is to consider "navigation".
The aircraft is flying, where where is it actually going? Are we upwardly in the cruise at 38,000 feet or are we just airborne out of Zurich flying downwardly a valley?
"Navigation" will depend on the stage of flight. Have we just taken off, and nosotros're still shut to the basis? Have nosotros lost an engine and demand to consummate an emergency turn?
Perchance we were in the prowl merely a loss of pressurization has resulted in us in an emergency descent. Are nosotros surrounded past mountainous terrain and need to consider an escape route?
Terrain, weather, traffic, system failures, remaining fuel – these are just some of the considerations when it comes to navigating the shipping.
Communicate
The aircraft is secure. The flight path is safe. Only now practice pilots consider the "communication" phase.
There will exist a number of people we demand to communicate with. Air Traffic Command will feature highly on that list though they may not be the get-go people we need to speak to. Although we may accept had to deviate from our clearance and we need to tell ATC soon, there may exist higher priorities.
Many technical issues on shipping happen slowly. There are some that, by their nature, have to be actioned quickly though. In the instance of our emergency descent instance, in that location will be memory items the pilots volition need to practise to protect the aircraft and everyone on board. (More on retention items here).
In this state of affairs, while we need to tell ATC about our emergency, the first communication will likely be a PA to the cabin "Attention, Attending, Emergency Descent ". This cursory call is enough to alarm the crew to the state of affairs and for them to complete their immediate actions – they volition buckle up in the closest available seat and the crew member inside reach of the interphone volition existence telling (yelling?) instructions to the passengers – belt up, concord on and become your oxygen masks on!
When appropriate, the advice to ATC may involve declaring a MAYDAY or a PAN-PAN. Depending on when the emergency arises the initial telephone call to ATC might exist very brief: "MAYDAY MAYDAY MAYDAY BigJet123 engine failure, continuing direct alee" or "stopping on the rail" as appropriate. The all-time response from ATC to this initial call is acknowledgement of your emergency. They know y'all'll be busy and they'll exist waiting for more than information.
The controller is probable to be busy as well – advising nearby sectors or airports of the emergency and clearing other aircraft out of your way.
At an appropriate fourth dimension, you lot'll need to update ATC and likewise the flight attendants/motel crew and the passengers on the developing situation. Its of import this communication is concise and clearly passes all the relevant information, with no room for misunderstanding.
Often the acronym NITS is used to convey information in aviation.
How is NITS used in aviation?
In aberrant or emergency situations communicating clearly is key. Equally a coiffure you demand to convey what your issue is, what that means and what you need of the other party. NITS (Nature – Intention – Fourth dimension – Special Instructions) is frequently used in aviation.
Due north – Nature
This is the "nature" of the problem. This should be curtailed – one or 2 sentences should be enough. How you convey the "nature" will depend on who you're talking to – for example, in the event of a damaged engine after a birdstrike it would be important to convey the fact the engine was damaged then the runway can be checked for FOD (Foreign Object Damage) in example in that location is debris on the departure track.
Perhaps for passengers, "bird strike" might be a sufficient clarification.
I – Intention
What is you're intention – to divert to some other airport, return to the bespeak of difference, enter a hold to complete checklists etc.
At this point it's important to tell the cabin if this will be a normal landing, or an emergency landing. They will follow different procedures depending on the blazon of landing expected.
A direct-forward engine flameout might exist considered a "normal landing" where yous wait to exist able to terminate on the runway.
But with a serious hydraulic result or loss of control, information technology might be more than appropriate to ready for an "emergency landing" (with passengers and crew briefed appropriately and bold the "brace position" before landing).
T – Time
If you lot're returning to the point of departure or diverting to another airdrome, the coiffure volition need to know how long they have to ready the cabin for landing.
S – Special Instructions
This is the part where you tell everyone what you need. Yous've declared an emergency and yous're the nearly important aircraft in the sky. The annunciation of a MAYDAY gives the commander the ability to break any rules they see fit to ensure they go the aircraft on the ground safely.
Do you need the crew to perform a visual inspection of the wing? Practise you lot want emergency services on standby for arrival? Or in the event of go-effectually, do yous really desire to be attempting a complicated missed arroyo on one engine? Possibly a become-around directly alee might be bachelor (bearing in listen terrain and obstacles).
Life on the Line – Squawking 7700
Pilots, in their entire careers, volition likely squawk 7700 or declare a Mayday a number of times.
I say declare a mayday or squawk 7700 considering in some situations air traffic control (ATC) may prefer you to go along your original squawk. This volition depend on the state of affairs at mitt and ATC (if you're in contact with them) will let you know their preference.
In "no time bachelor" emergencies it's a good idea to squawk 7700. Setting 7700 in the transponder will alert other units and nearby sectors that you accept a problem.
For example, post-obit a sudden loss of pressurization will most likely result in an emergency descent – squawking 7700 will alert nearby ATC sectors (including the one below y'all) that yous have an abnormal situation.
I've alleged a mayday (and a PAN-PAN) a number of times. On the accept-off curlicue, very close to V1 (the speed at which we must continue the take-off – i.e. stopping is not a possibility) we got a warning of low hydraulic pressure. A "GO" call was fabricated – at high speed, and with doubtfulness about the diverse hydraulic systems that assistance united states stop (brakes, spoilers etc.), it was safer to continue the have-off and deal with the problem in the air.
The alert was existent. We advised ATC we had a problem and as nosotros were still diagnosing the trouble, and in busy airspace, nosotros declared a PAN-PAN.
This let the controller know nosotros had a problem, we're likely to be busy for a while and there'south a chance we may not exist continuing the flying every bit planned. They best-selling the PAN phone call and requested we squawk 7700 which would let adjacent sectors know the controller was dealing with an emergency.
We were able to "clean up" the aircraft (i.due east. retract the gear and flaps), admitting at a slower speed than normal. ATC assigned us a "discreet frequency" (one that was simply for usa) and gave us the begetting of the nearest runway. This was great information only information technology showed an data gap – we had been so busy completing checklists and flight the aircraft we hadn't give ATC an update – all they knew was nosotros had a "hydraulic trouble" – they didn't know how serious it was.
We had diagnosed the issue, worked out exactly what had caused the indications nosotros were seeing and we had dealt with the initial ramifications. We were in a great situation – we had the initial problems sorted, we were flying with no issue and we had just taken off and so nosotros had plenty of fuel. We had plenty of time.
A great decision making tool is the pneumonic DODAR – Diagnose Options Determine/Do Assign Review/Adventure
Diagnose – we had gotten the "low hydraulic level" merely before V1. We were able to clean the shipping up but the flaps/gear moved slower than normal. The quantity in one of the systems showed low level.
And a quick check of the other systems showed no issue or damage to whatever other organization. Our diagnosis was a straight forward hydraulic leak and loss of ane system.
Options – considering the "big motion-picture show" initially our options are ordinarily to 1.) continue the flight, 2.) to return to our difference airport, or 3.) to divert. With degraded systems we weren't happy to continue the flight – then that was discounted.
A return was an choice simply as the runway was peradventure contaminated by hydraulic fluid information technology might not exist available for some time. There were other airports in the area, with long runways, so we decided to divert.
Make up one's mind/Do – so based on our diagnosis and a review of our options we've decided to divert. Now's a skillful time to tell ATC of our plan. Knowing we nevertheless take checklists to gear up for landing and we need to brief the cabin crew and passengers, we request to enter a hold. We're in a safe position with plenty of time.
Assign – the type of failure may dictate who must fly the aircraft (for case in a reduced electrical state of affairs the but screens bachelor in the cockpit will be the captains). Normally in a situation with reduced systems the Captain will land the shipping.
Oft the First Officer volition take command of the aircraft in the hold, get the latest airport information and weather (ATIS) and program the "box" for the arrival. The Captain will be busy, first briefing the cabin coiffure on the current situation, and then updating the passengers.
So we have "assigned" the Kickoff Officer to accept control and set up for the arrival, and the Captain will cursory the cabin coiffure and passengers, before taking control to wing the arroyo.
Review/Risk – then every bit a review we have lost one hydraulic organization, the other hydraulic systems are operating normally and there are no other issues with any other aircraft systems.
What are the risks? Well we've lost ane hydraulic source – not a big deal, but nosotros've really lost redundancy. The loss of one hydraulic system on modern aircraft is non likewise serious, just the loss of a 2nd can make things complicated. We will mitigate this risk by diverting and landing soon, rather than continuing on.
Other risks? The hydraulic failure ways reduced braking and footing spoilers. The runway we accept chosen is long and a bank check of the performance figures shows we should have no result stopping. However, equally a precaution, we request the emergency services on standby for our arrival.
Once nosotros were both satisfied with the plan we completed our checklists and left the hold to begin our arroyo. We took a long final and configured early. The longer approach and early configuration gave us time to "feel" how the aircraft behaved in this situation – it felt sluggish only easily controllable.
Nosotros landed normally, and even with the reduced braking, we were able to comfortably slow the aircraft and vacate the runway, stopping on a taxiway. We spoke to the fire vehicles who had just surrounded us and asked them to acquit out a visual inspection of the aircraft.
We did a PA to the passengers to explain that the vehicles outside we not a cause for a warning and were just routine in this type of event. The fire chief called us on the radio to report everything appeared normal and they would follow the states to the gate.
Mayday Example: ThomsonFly Mayday at Manchester
The video below illustrates some of the data above.
The initial call to ATC explains clearly they are declaring a Mayday, and their routing.
The answer from ATC is every bit concise and with relevant information.
Aviate: They command the aircraft and bargain with the initial failure.
Navigate: They ensure terrain clearance and advise "continuing due north-westerly and inbound towards Wallasey" VOR.
Communicate: Once the aircraft has been stabilised, they are navigating away from the terrain, then they communicate at 0:fifty their initial intentions.
At two:00 ATC tells them to "Squawk 7700" which volition warning nearby sectors and airports to the ongoing emergency.
The video speaks for itself – its an instance of excellent piece of work by both the crew and ATC in a busy and challenging situation. All communication is concise and to the point and everyone involved contributes to a safe outcome.
A chore well done!
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FAQ Summary – Squawking 7700
How exercise pilots squawk 7700?
To squawk 7700 pilots enter that code into their transponder which volition alarm ATC that they are experiencing an emergency.
What does FOD mean?
FOD (Foreign Object Damage) refers to debris that tin cause damage to aircraft and aircraft engines.
What is a discreet frequency?
A discreet frequency is when Air Traffic Control assign a specific frequency solely to i aircraft. This is often done in emergencies when a greater amount of radio communication can be expected.
How many squawk codes are there?
As squawk codes are 4 digits long and each digit tin range from 0 to 7, there are a total of 4096 squawk codes available for use.
What is an emergency descent?
A pilot may accept to carry out an emergency descent due to the sudden loss of cabin pressurization. An emergency descent is a rapid descent to a lower level commonly at the maximum rate of descent possible. An emergency descent from prowl altitude to 10,000′ may take approximately 40nm and 4 minutes to complete.
What is an emergency turn?
An emergency turn in aviation is a proscribed turn used in the event of an engine failure on departure where the loss of an engine would not allow the aircraft to complete the SID (Standard Musical instrument Departure). For instance, in areas of high terrain a normal difference will specify the climb slope required to clear the terrain. If the loss of one engine would mean the aircraft could not clear the terrain, an emergency plough will exist proscribed which will bring the aircraft abroad from the terrain.
What is an escape route in aviation?
In the issue of an engine failure in the prowl where the shipping cannot maintain the cruise level, the shipping volition "migrate downwards" to a lower level. If this lower level, post-obit the loss of an engine, is not sufficient to clear terrain and escape route volition exist proscribed to navigate the shipping away from the high terrain.
What are the emergency squawk codes?
7500 – Unlawful interference (hijack)
7600 – Radio advice failure
7700 – General Emergency
Pete has been flying aircraft for the concluding 20 years. He has flown everything from light piston aircraft up to heavy jets equally both First Officer and Captain. He'due south currently enjoying life flying the Airbus A330 for a major international airline.
Source: https://www.aviationmatters.co/squawking-7700-in-aviation/
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