Re: Round opening on early DC-9s

That’s the outflow valve. Used to control cabin pressurization. In auto mode will be open on the ground and closes to control cabin rate of change and desired cabin altitude in flight.

Re: Beacon Light Question

Led vs. strobe light. The strobes flash as the capacitors in the light discharge. Very bright but a short duration. The led's have a driver that controls the length of time the led is on. The slightly longer duration is more visible while still having the strobe effect.

Re: Can steel brake pads be used in systems designed for carbon?

We converted our 737 NG fleet to carbon. What other changes needed to be made aside from the wheels and brakes themselves? Did you need to modify the ABS system for instance? Regards, JetMech It is more than just the brakes and wheels. I cant remember if it was a LRU change or a software update for...

Re: L1011, so many versions ?

The -1 is the original design. I’m going off memory so I hope I still remember this stuff. -100 was an increased gross weight model. -200 had more powerful engines -250 had more “upgrades” I can’t remember specifics. -500 was a shorter fuselage long range model. Those were all factory built variants...

Re: A350 Flight Deck Printer?

The blank panel you are referring to is the printer. The top is a smooth blank plate except for the four buttons that control it. There is a seam on the top between the fixed portion where the buttons are and the movable section which opens to load paper. That seam is also where the printed paper ex...

Re: Question about stab trim systems

dtwpilot225 wrote:

So like c and d checks then?

Re: Multi-engine type fleet of same aircraft

In DL's case most of the 767 fleet was purchased new. So why the mixed engine types? With out knowing the financial details we can only guess. The newer build engines from another manufacturer could have achieved performance gains over the original fleet. The acquisition cost could have been better...

Re: A330 Nose Landing Gear

Wheel stop bar. Designed to keep the wheels in the center line position and the strut extended in case the strut is leaking when the gear is up.

Re: 737 nose creases

Without a picture it's just a guess but you are probably talking about the lightening diverter strips. The strips give the lightening a path to travel through and limit any damage to the composite radome.

Re: DL 8905 -744 UGA football charter to LAX

litz wrote:

Or perhaps not ... apparently there are none scheduled past Jan 2nd.

Re: Emergency lights switch 737 800

To place the switch in either the Off or Armed position the guard must be lifted to the open position. Closing the guard will return the switch to the center Armed position. This happens either by the guard itself pushing the switch down to center or a lever internal to the guard that will pull the ...

Re: Swiss HB-IJS Wing Damage

It appears to just be fairing damage. Secondary structure for aerodynamics. Besides it was only out of service for 24 hours. If there was any structural damage it would have been out of service much longer.

RE: KLM 737-400 Why 3 Lav Service Ports?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/77west" class="quote" target="_blank">77west</a> (<a href="#7" class="quote">Reply 7</a>):<br/><i>So I assume the 737NG has vacuum lav then? </i...

RE: Radio Altimeter Indication On Ground

The 737NG's read -4 at the gate. At touchdown with the nose pitched up it reads 0. As the plane rotates back to a ground attitude and the gear compresses you see the negative altitude.

RE: Cabin Wear And Durability

Overhead bin doors are always being broken when a pax try's to force a door closed over a bag that doesn't fit. Usually it is the inserts that hold the hinge on being pulled out of the panel. Sometimes the entire panel fails. Tray tables and arm rests are broken all the time. I cringe when I see som...

RE: 767 Inlet Identification?

It's a membrane based system. The pressurized air is forced through the membrane separating the nitrogen. It's not pure nitrogen but it is more than enough to reduce the overall percentage of oxygen in the tank and therefore the risk of ignition.

RE: Air-conditioning System And Cabin Pressurisation

As said already the pack use an ACM to produce cold air. The air coming out is just above freezing. Hot bleed air is then introduced to warm the air to the desired temperature. Larger a/c have multiple zones of heating an cooling. The air from the packs is added to a mix manifold where hot air is ad...

RE: Protrusion On Recent 757's

It is an air to ground antenna for the gogo wifi system. They were added as part of the mod to increase bandwidth.

ATL Construction

Yes part of the pad is gone. I'm not 100% but I remember hearing they were building a deicing pad.

RE: US Airways 319 N767UW Question

Air to ground wifi antennas. We have them at DL to. They have been adding the sidemount antennas as part of the upgrades to increase bandwidth.

Black Tar Substance Over Inside Of Cowl

I think the cleaner you are thinking of is call skykleen.

RE: Access Panel Shape On The TE Flap Fairing - B752

Mel, I took a closer look at one of our 757's last night. That access cover falls in the middle of a seam on the canoe fairing. There is an internal doubler and the fasteners in that doubler follow the perimeter of the cover. My guess would be it's a trade off for strength. The small round area in t...

RE: DL MD90- Fleet Reliability?

In general the MD90 fleet is pretty reliable. I can't think of any issues that are only present in a particular subfleet from one previous operator.

RE: Virgin 747 Unusual Marking

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/by738" class="quote" target="_blank">by738</a> (<a href="#4" class="quote">Reply 4</a>):<br/><i>isnt it the little name "Ladybird" painted on in...

RE: MD82 Yellow Triangles On Wing

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/HAWK21M" class="quote" target="_blank">HAWK21M</a> (<a href="#6" class="quote">Reply 6</a>):<br/><i>What is the <acronym title="Melbourne - Tull...

RE: How To Get EASA-66 For FAA A&Ps?

Not that I know of. Good luck, it's a lot of work. The EASA system is much different. More training hours More license categories, Aircraft-specific training and certification and Recurrent training. I personally like the EASA system. I feel it is designed to ensure the people working on aircraft ha...

RE: Why The Dip On Runway 8R/26L @ ATL

It's mostly due to the original slope of the land. There is a downward slope to the east. Also the airport was built over the Flint river which now runs under the field. It's source is just to the north. I'm sure it affected how the land was sloped. The east end of all the runways and taxiways was b...

RE: Are All MD-80 Series Still Flying W Jackscrew Issue?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Starlionblue" class="quote" target="_blank">Starlionblue</a> (<a href="#6" class="quote">Reply 6</a>):<br/><i> I don't think the DC-9/Mad Dog is...

RE: Delta Pilot Scheduling

At DL the MD88 and MD90's are flown by the same crews. So one crew could bring an 88 in and fly out on a 90 the next day.

RE: 777 Thrust Reference

It is the takeoff power setting. In this case N1 speed 99.9%. Based on the takeoff weight, temperature, etc...

RE: Aircraft Names Or Reg?

At DL we use the tail number.

RE: Manufacturer Of DL MD-88/MD-90 Bin Extensions?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Sinlock" class="quote" target="_blank">Sinlock</a> (<a href="#2" class="quote">Reply 2</a>):<br/><i>It's safe to say that every ramp worker who'...

RE: Aircraft Time Question

On some aircraft when the boarding door is closed and the anti collision beacon is turned on an acars message is sent showing the a/c out.

RE: Engaging Spoiler On Boeing 777

From what i saw in the video the flight spoilers were deployed for part of the decent. Once the flaps were deployed they created enough drag and the flight spoilers weren't needed anymore. The small movement of the flight spoilers you see through the rest of the approach is tied to the movement of t...

RE: Where Do Commercial Airliners Do Their Run Up?

If i had to guess. I'd say they were doing a cross bleed start.

RE: Altimeters And Rotation

I don't recall seeing it on other a/c. But on the 737-800 the radio altimeter show's -4 feet when the a/c is on the ground. It was explained to us in class that in the landing flare the <acronym title="Royal Nepal Airlines">RA</acronym> antenna is approx 4 feet higher and will read 0 when the mains ...

RE: Light In The Landing Gear Bay

It is a warning light to stay clear of the landing gear doors. Any time the gear doors are opening/closing or if the gear is in transit the light will be on. It's meant to warn people working in the area on the ground but the system still works in the air.

RE: APU On MD-80 Series

To answer the original question. The apu is mounted in the belly just behind the aft pressure bulkhead. The inlet is also on the belly which makes it very prone to ingesting any leaking hydraulic fluid leading to smoke in the cabin.

RE: Looks Like A Pitot Tube?

Looks like an AOA (angle of attack) sensor to me

RE: What Is N1 /N2 / N3?

N1 <acronym title="Aerolineas Internacionales SA de CV (Mexico)">N2</acronym> and N3 are indications in percentage of the rated speed of a given engine section. N1 is fan speed. (the big one in the front) <acronym title="Aerolineas Internacionales SA de CV (Mexico)">N2</acronym> is the intermediate ...

RE: DL Adding Winglets To Domestic Non-ER 767-300s?

The STC I've seen is approved for the 767-300 and 767-300F. There is nothing specified about the <acronym title="DHL Worldwide Express (Belgium)">ER</acronym>'s. The <acronym title="DHL Worldwide Express (Belgium)">ER</acronym>'s have been getting the winglets because of the long flights they are on...

RE: Question About 727 Nose

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RE: Panel Numbering Query

I'm pretty sure that the flight engineer's panel was the P4. That's why you don't see it on the 757 and 737.

RE: Different Aircraft, Same Tires?

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RE: [fuselage/skin] Doublers

You couldn't see page 136?

How about this.



Not your typical finger doubler but you can see the idea behind it.

RE: [fuselage/skin] Doublers

Here is a link to some images.

Airplane Design Book

RE: What Drives The Air Cycle Machine (ACM)?

The air passing through the turbine of the acm is what drives it. As long as you have bleed air going in the acm will spin.

RE: 777 Heavy Maintenance - C-Check Question

I don't know what the actual cost is but the majority of the cost in labor. Most repair station jobs don't pay well and many don't use licensed techs. This keeps their labor costs way down. If the repair station is in a third world country the wages are much lower. Dollar for dollar it's impossible ...

RE: MD11/DC-10 Tail Engine

It's on the aft pedestal. You have to look for it. I worked on 88's for years without ever looking and never noticed it was there.

RE: MD11/DC-10 Tail Engine

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Hel...