DC93 horn

[Lluis del Cerro]

Hi,

I fly regularly the DC-9-30 and yesterday I found something that never happened before: after take off the DC-9-30 started to sound the horn without any panel light and without any chance of switching off. It is the same horn that I can disable in one of the panels of the Boeing 727-200 but I did not find the place to disable it in the D93 and, again, never heard before in this aircraft. Any advice?

Thanks in advance,

Lluís

[aerofoto - HJG Admin]

A number of circumstances can trigger that horn .... from flap/trim miscongfigurations .... to failure to set the cabin pressurization system correctly .... but .... any such horn activation should normally result in the MASTER CAUTION lamp being illuminated as well as the reason for its activation then being displayed as an illuminated indication within the Aunciator Display on the Overhead Sub Panel.

Aussuming you´re using the HJG supplied DC-9 panels ....

"IF" that horn ever activates .... and remains activated .... then .... on the upper portion of the Main Panel, immediately below the windshield support frame, and located to the left of the paired Landing Light switches, you´ll see a small grey knob labelled "HORN CANCEL" .... just right mouse click on this knob and that should cancel the horn for you .... and then simularly right mouse click on the MASTER CAUTION warning lamp "after" attending to/resolving the indicated problem.

9 times out of 10 times the reason why this horn is activated is due to failure to configure the panels pressurization System correctly .... located on the Ovehead Sub Panel .... and which "WILL" then trigger this horn after climbing above 10,000 FT.

"IF" you´re new to the HJG DC-9 simulations .... and these panels .... then I encourage you to review our forum based manual for these simulations and which is "quite thorough/comprehensive" given the level of complexity associated with these panels.

Here´s the link to this manual ....


DC9 PANELS INSTALLATION & HANDLING NOTES
tonymadgehjg.proboards.com/thread/3435/hjg-panel-installation-handling-notes


May I refer you to the following sections of my manual ....


SECTION 3 - 2.1: OVERHEAD PANEL (re cabin pressurization)

SECTION 3 - 4.0: CENTER PEDESTAL PANEL (re cabion pressurization also)


I´m pretty sure this might be the reason for your experience .... as it´s the most common cause of such a horn activation

Mark C
BOG/CO

[Lluis del Cerro]

Hi Mark,

Thank you very much for your fast response and for the indications in your post.

I sincerely have no idea what may cause that horn that day. Just to clarify:

1. I am using the HJG panel for that precise model of aircraft (sounds, effects, etc.).
2. I am not new at all for that aircraft. I have been flying it for years. The same as for the B722, DC85, B463 and other aircraft of HJG which belong also to our company's fleet with great pride for us.

I did not receive any warning or caution light in the master lights and neither in the warning system lights. This was the most surprising thing for me when I heard the horn.

I did not use the grey knob because I cannot read its label. It is the only label in that main panel that is unreadable for me due to the size of the letters.

It might be a problem with the setting of the pressurisation system, although I always set it and never before in years I had any problem. The sound started just immediately after taking off Janeau (PAJN) in Alaska.

I already edited the guide for that aircraft and panel when I started flying that aircraft, although I promise that I will recheck again the forum just in case there may be a better manual now.

Thank you very much again. Your advice has always been very helpful.

Best regards,

Lluís

[aerofoto - HJG Admin]

In the case of Pressurization ....

As you commence your T/O roll don´t forget to right mouse click on the yellow tab, located within the lower right middle section of the Center Pedestall sub panel (visible per the following image) ....



.... raising it to its "CABIN ALT" detente .... then once established in the climb with everthing cleaned up/under control and the simulation on AP .... go to the Overhead sub panel, and set the Presurization system, located within the lower right section of the O/H sub panel (visible per the following image) ....



.... to the desired cabin altitude value.

For FL250 cruise I generally set it at around 6,000 FT .... and for FL310 cruise I generally set it at around 8,000 FT.

HOWEVER .... the yellow tab, on the CP sub panel, must always be set toward its "CABIN ALT" detente "prior to/during" T/O .... or the simulation simply will not pressurize .... and which will trigger the horn when climbing above 10,000 FT.

I can´t relate .... from memory .... to any other particular condition that might cause that horn to activate imediately after T/O though .... other than possibly a misconfigured Elevator Trim setting maybe .... or possibly gear retraction with greater than a FLAP 15 setting, or, flap extention in excess of FLAP 15 without the gear extended.

I´ll come back/post later .... if I remember anything else.

Mark C
BOG/CO

[Lluis del Cerro]

Good morning Mark,

I always do what you say in your last post. Years ago I prepared a sort of checklist after the general procedures for this aircraft and I follow it strictly every flight. As said, I discovered this horn two days ago after years of happy flights with this wonderful DC93.

Do not worry and do not spend your time with this thread any longer. Now I know where to find the knob to silence the horn if it ever bothers again although I hope not to hear it any more.

Yesterday, following your link, I discovered that this aircraft has a major update since year 2015. I will download and install it again and I will also try the DC-10-40 ...

Thanks again for your time and for those wonderful aircraft,

Lluís

[aerofoto - HJG Admin]

Just a quick explanation in regard to to this statement ....

I discovered that this aircraft has a major update since year 2015

PLEASE NOTER: There have been no updates to any of the DC-9 Aircraft Base Packs/Models/FDE, Effects, Panels, and sounds .... "almost" since these sumulations were first launched during 2010.

You might be referring to the October 18th 2015 last updated date associated with "SECTION 1" of the DC-9 manual.

All this would have been in relation to is a minor edit/s or correction/s (sometimes just spelling/grammar related only).

Any other manual updates post 2010 would relate to very minor changes in regard to the recommended handling procedures for these simultions .... or .... to draw attention to any issues we are aware of, but, cannot fix .... as are communicated within "SECTION 3 - 9.0: KNOWN ISSUES" of the DC-9 manual.

I do update all of our manuals whenever I feel the need arises .... usually on the basis of greater experience with our simulations.

Once again .... there have been no updates, at all, for any of thour Dc-9 simulationsd since around 2010 .... at lease not in regard to our versions of these

Mark C
BOG/CO

[Lluis del Cerro]

Good morning Mark,

Thank you for the clarification. I will check for the update in the manual. By the way ... do you have any copy of it in pdf format? It is easier to print and easier to read during my long trips from home to work and return.

Have a nice day,

Lluís

[aerofoto - HJG Admin]

Unfortunately "NO" Lluis

I opted for the locked forum posting type of manual presentation in prefernce to a PDF .... because it´s the simplest means, for me, to be able to edit (online) in respect of any recommended changes of procedure (which do occasionally happen), as well as edits in relation to future additions and upgrades too .... without having to uploaded a new PDF each time.

If you, personally, want to make a PDF copy of my manual .... as is currently presented here .... then I have no problem with that .... since it´s "MY MANUAL" and "I SAY" you can do so .... and distribute it, at your pleasure, if you desire (con mucho gusto) .... "provided it "IS NOT" further edited without my knowldge or consent and that all/any queries regarding it are directed, to me/us, here at HJG") .... and that you also remain aware that these presentations, and their content, can be/and often are, edited, by me, without notice and as as I deem necessary.


Just comming back to your DC-9 alarms for a moment .... and out of pure curiosity


Were you experiening a "constant" alarm tone (like BEEEEEEEEEEEEEEEEEEEEEEP ....) .... OR .... and interrupted alarm (like BEEP-BEEP-BEEP-BEEP) ?

A constant tone could be triggered by a number of scnenarios .... ranging from low fuel pressure, low hydraulics pressue, in correct configuration or shutdown of one of the elegtrical generator systems, or incorrect configuration or failure of the pressurization system. Each of these scenarios would normally trigger an illumination/light on the annuniator warning system located at the top of the main panel .... an (enlarged version of which is also located at the bottom of the overhead sub panel .... BUT .... only a pressurization problem will trigger both an anunciator light as well as the Master Caution lamp on the main panel

An interupted tone would normally be triggered by .... flaps being set in excess of 15 degrees or a ZERO flap configuration being selected during throttle advance and prior to T/O, excessive or insufficient elevator trim setting prior to T/O, or flap 20 configuration being selected on approach to landing and prior to extending the landing gear .... neither of which will trigger an anunciator indication/light or the Master Caution lamp though.

The constant alarm tone can always be cancelled as previously discussed.

The interrupted alarm can only be cancelled by identfying, and correcting, the flap/gear/trim scenario which triggered it.

Marck C
BOG/CO

[Lluis del Cerro]

Hi Mark,

Perfectly understood and in absolute agreement with your "restrictions" concerning any manual. Besides writing manuals myself, I enjoy editing them for a joyful reading. I will ask you for permission in case I decide to make it in book format.

Concerning the alarm tone, it was constant. Please do not waste a minute more in this issue. I am sure it was my fault and if it ever happens again, at least I know how to turn off that annoying noise.

Thanks again for your time and good will,

Lluís

[aerofoto - HJG Admin]

I don´t mind offering further opinion (if I can) in regard to those DC-9 panel alarms Lluis

The way I see it is it´s bound to (hopefully) aid more folk than whom ask any question .... and which is another reason why I generlly prefer replyinmg at length/"in detail" in response to any query I can possibly assist with.

Con mucho gusto

Mark C
BOG/CO