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FOMS Menu 428 (MEL/CDL Codes - WebFOMS MEL/CDL Dictionary)

Note: The following descriptions represent the typical access and privileges afforded to users designated as Dispatch Managers/Supervisors. Users with dispatcher privileges will have limited access to a subset of the screens presented.

For an overview of the WebFOMS features see the Aircraft Characteristics screen. The features described there can be applied to all screens.

Edit

For instructions on how to make modifications on the WebFOMS screens, see Modify, View Aircraft Characteristics. It uses the Aircraft Characteristics as an example but can be applied to all WebFOMS screens.

Screen

Screen is the default view when you first go to a WebFOMS screen. When Screen is selected you can view all records that exist in the system.  Select the arrow in the first field of the WebFOMS screen to access the drop-down menu to view the list of available records.

Only items that exist in the database are shown in the drop-down list.

FOMS 428

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WebFOMS MEL/CDL

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This program permits the creation and maintenance of a data file of Minimum Equipment List (MEL) and Configuration Deviation List (CDL) code numbers and their corresponding explanations and descriptions. The descriptions are limited to either 50 or 60 characters depending on the classification of the item: operational or non-operational respectively. The descriptions are not intended to be definitive; the objective is to make them detailed enough to alert dispatchers to any restrictions that may affect flight planning. Up to 10 lines of comment may be added to each item to more fully describe it. These comments are attached to the flight plan and will thus be available to the flight crew.

The modes available are:

  • Add
  • Edit
  • Delete
  • Video
  • Screen
  • Hardcopy
  • Quit
  • Copy

Add

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Aircraft type/series/engines – enter to make MEL/CDL as specific as needed - the series and engines fields are no longer mandatory. This means that you can create a MEL or CDL and assign it to multiple aircraft with the same equipment type.

ALC – for multi ALC customers

MEL or CDL item – enter “M” (MEL) or “C” (CDL)

MEL or CDL item number – enter number as per MEL equipment list

Operational – If selected (checked), the code and description will appear on the flight plan. If not deselected (not checked), information will only appear in the info area of NFP’s plan screen. Default is deselected.

MEL or CDL item description.

Comments – for internal use only.

Reference code - Enter either M for MEL or C for CDL, along with the item number. This MEL or CDL item will use the same penalty than the MEL or CDL item entered in this field.

Installed - Enter the amount of units installed on the aircraft. This could be A/C packs numbers, or any other system component which can be partially inoperative.

Required - Enter the amount of units required for dispatch.

Effect types – The effect type will dictate which penalty to be applied to the flight plan calculation. See list of effect types in this document.

Effect Type Code

Description

Unit

Value

Comments

APU

APU duration on for flight. 

N/A

N/A

This calculates the fuel burn based upon the value in the airline code parameters.

DDW

Increase Drift Down Weight

Weight unit (lbs/kgs)

Enter value in lbs or kgs

This value is added to the driftdown calculations

Generates a warning when Notify is set to Y in the MEL. The message can be added to the format via MEL format variables.

ENC

Increase Enroute Climb Weight

Weight unit (lbs/kgs)

Enter value in lbs or kgs

This value is added to the enroute climb calculations

Generates a warning when Notify is set to Y in the MEL. The message can be added to the format via MEL format variables.

ETU

ETOPS unavailable

N/A

N/A

Defaults immediately on UI

ETR

ETOPS time reduced by X minutes

N/A

Enter time in minutes

Defaults immediately on UI

ETF

ETOPS time set to X mins

N/A

Enter time in minutes

This sets the ETOPS time to set value instead of a time reduction.

FCP

All fuel consumption percentage increase

N/A

Enter percent bias increase

Bias applied automatically during compute

CLP

Climb fuel consumption percentage increase

N/A

Enter percent bias increase

Bias applied automatically during compute

CRP

Cruise fuel consumption percentage increase

N/A

Enter percent bias increase

Bias applied automatically during compute

DSP

Descent fuel consumption percentage increase

N/A

Enter percent bias increase

Bias applied automatically during compute

HDP

Hold fuel consumption percentage increase

N/A

Enter percent bias increase

Bias applied automatically during compute

MFL

Maximum flight level restriction

N/A

Enter flight level in hundreds of feet

Restriction applied during route selection

CRZ

Restricted to use specific cruise profile

Performance profile key weight unit (lbs/kgs)

Enter the performance profile key

Defaults immediately on UI

MCH

Maximum Mach speed allowed

N/A

Enter Mach speed

Post-compute check performed

REV

Revenue operation unavailable (no payload)

N/A

N/A

Default maximum payload is ignored, then post-compute check is performed

TOW

Reduce maximum takeoff weight by X lbs/kgs

Weight unit (lbs/kgs)

Enter weight reduction amount

Post-compute check is performed

MLW

Reduce maximum landing weight by X lbs/kgs

Weight unit (lbs/kgs)

Enter weight reduction amount

Post-compute check is performed

ICE

Avoid icing PPI

Threshold for avoidance

0.0 - 2.0

NFP will avoid areas of icing for PPI value > FOMS 220/170 input based on light/medium/heavy category

RVS

RVSM flag set to NO

N/A

N/A

Applied during route generation, then post-compute check is performed

TME

Time of day restrictions (night time not allowed)

N/A

N/A

Post-compute check is performed

CAT

Cat II/III not available (lower weather minimums)

N/A

N/A

Not currently supported

MEA

Flight route cannot be over high minimum enroute altitude

N/A

 

N/A

Not currently supported

MUF

Reduce Max uplift weight by X lbs/kgs 

Weight unit (lbs/kgs)

Numeric value in lbs/kgs

N/A

UUF

Enter amount of unusable fuel

Weight unit

lbs or kgs 

Add a fixed amount of unusable fuel in flight calculations - treated similarly to ballast.

ADL

Add additional fuel to the MEL/CDL class

Weight unit

lbs or kgs 

Displays ADL fuel in the CONTG field on the fuel log

DDB

Reduce drift down ceiling if OAT <= ISA

Flight Level

Enter flight level in hundreds of feet

reduces the drift down ceiling by the value set if the OAT <= ISA

DDA

 

Reduce drift down ceiling if OAT > ISA

Flight Level

 

Enter flight level in hundreds of feet

reduces the drift down ceiling by the value set if the OAT > ISA

TKG

Amount of fixed tanker fuel

Weight unit

lbs or kgs

Enter the fixed fuel penalty to show in Tankering field

IIA

Remove code from ICAO item 10a

10a Equipment Code

Enter the equipment code to be removed.

Each 10a code requires its own IIA entry in the MEL.

IIB

Remove code from ICAO item 10b

10b Equipment Code

Enter the equipment code to be removed.

Each 10b code requires its own IIB entry in the MEL.

IIR

Add to ICAO item 18 remarks

N/A

N/A

N/A

BAF

BAF (Bias Above Flight Level) Mel Effect type in combination with the Operating Count field.

N/A

Enter percent

 BAF allows you to enter a percentage penalty and the flight level above which the penalty applies.  (example:  apply a 2% fuel penalty above FL310)

Enhanced MEL Effect for ISA Penalties 

An effect in the MEL/CDL Dictionary has been created to address a penalty that would reduce the drift down ceiling if the outside air temperature (OAT) is above or below an offset of standard ISA.

This item was developed in response to MEL 30-21-01 on the Airbus 318/319/320/321 for Engine Anti-Ice Valves. Please consult your airline's MMEL for specific penalty requirements.

How to Apply the Effect

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In the MEL/CDL Dictionary, a Key will appear when using the effects DDB  (reduce drift down ceiling if OAT <= ISA) and DDA (Reduce drift down ceiling if OAT > ISA).  The Key allows you to set the ISA offset and if left blank it will default to 0. The ceiling is entered in hundreds of feet in the Value input field. 

Line 1 in the above figure states that if the OAT is less than or equal to standard ISA (0) then the drift down ceiling will decrease by 2,000ft.

Line 2 states that if the OAT is less than or equal to ISA + 5 degrees Celsius then the drift down ceiling will decrease by 600ft.

Line 3 states that if the OAT is greater than ISA + 5 degrees Celsius then the drift down ceiling will decrease by 4,000ft.

Add – Additional penalty value to be added per non-operating component(s). This must be used in conjunction with the ADL effect type. Value entered in this field will be multiplied by the difference between “installed” taken from FOMS 428 and “count” taken from FOMS 425.

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In this example, there are 4 units installed as per FOMS 428. When the MEL is assigned in FOMS 425 to the aircraft, the count is 2. Difference between installed and count is = 2.

The value entered for the ADL effect type with Add field set to Y is 5000lbs. This means that an additional 10,000lbs will be added to the flight plan.

The MEL penalty which will be applies will show in NFP’s info/view screen prior to the compute.

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Unit – LBS or KGS

Notify – Options are Y (yes) or N (no). If set to Y, NFP will generate a warning when the penalty is applied.

Oper Cond – Enter the operational count for the MEL.

 

Note: Not all effect types impact the flight plan output. Based on the effect type(s) used, NFP will generate a warning or an error so that manual corrections can be applied to meet the MEL penalty requirements. Refer to FOMS 170 for the MEL Check parameter.

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Effect Type -Unit

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This applies to the unit of measurement used to calculate the penalty.

Options are:

Units

Description

FL

Flight Level

PCT

Percentage

KGS

Kilos

LBS

Pounds

KIAS

Knots indicated

MACH

Mach number

Effect Type - Value

Enter a numerical value reflecting the effect type entered. An example would be:

If Effect Type = MFL (flight level restriction) and Unit = FL, then Value = 250 would mean the flight level would be restricted to FL250.

Effect type – Handled

 

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Effect Type - Notify

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If set to Y or checked, a warning describing the MEL limitation will be generated. If set to N, there will be no warning.

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Effect type - Operational Condition

This is where the number of units/equipment is entered for the penalty to be applied. If the value entered for CNT (op. count) in FOMS 425 or WebFOMS Screen is the same as the operating condition value entered in FOMS 428 for the MEL or CDL item, the penalty will be applied.

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Edit Mode

Enter the type, series, and engines of the aircraft, followed by the code number whose description/comments you wish to edit.

Note: You cannot edit the MEL/CDL number itself. If you have a particular item incorrectly numbered, it must be deleted and re-added with the correct number.

 

Delete Mode

Enter the Type, Series, and Engines of the aircraft, followed by the Code Number and M or C to indicate MEL or CDL. If no such record exists, then a Record Not Found - Press <Enter> for NEXT AVAILABLE prompt will be issued, and pressing <Enter> will bring up the next record in file alphabetically. You may then scroll through the data file record-by-record using the up and down arrow keys. If you reach either the upper or lower limits of the file, then you will be returned to a Command Line prompt.

Video Mode

Video mode allows you to review one record at a time. Enter the type, series, and engines of the aircraft, followed by the MEL or CDL number and whether it’s a MEL or a CDL. If the record you are looking for is not on file, then a No Records on file for prompt will appear.

Screen Mode

This mode differs from Video mode in that it allows you to review more than one record at a time. First, enter the type, series, and engines of the aircraft for that you want a report.

Operational? (Y/N/A): Indicate whether you wish to report only Operational or Non-operational items, or All records. The default is All records.

Type of Codes (C/M/A): Indicate whether you want MELs, CDLs, or All reported. The default value is All.

Code Number From/To: Enter the range of number for that you wish to nave items reported. The default values are 000000 and ZZZZZZ respectively.

Comments? (Y/N): Indicate whether you wish comments to be included in the report or not. The default option is N.

If you have selected a report containing both MELs and CDLs, all of the CDLs will be displayed first. A blank line will be inserted in the report whenever the first two digits of the code change, and to separate MELs from CDLs.

You may escape from the report at any time by entering <Q> to return to the Command Line.

Hardcopy Mode

The Hardcopy mode functions in the same manner as Screen mode, with the exception that the report is sent to the printer, and hence you do not have the ability to terminate the report in midstream. Caution should therefore be exercised in the selection of the range of items to be printed.

Quit Mode

Enter <Q> from the command line to exit the program. You will then have the option

Cumulative MEL/CDL Penalties

Fields in the FOMS 428 / WebFOMS MEL/CDL Dictionary and FOMS 425 / MEL CDL Assignments screen allow you to calculate cumulative MEL/CDL penalties.  You can maintain a single penalty effect on a MEL or CDL code. To indicate that a penalty is cumulative a user must set the Is Value Per Non Operating Component to <Y> in the FOMS 428 menu or WebFOMS MEL/CDL Dictionary screen.

See example below:

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This FOMS 428 menu shows that Slat Bulb seals have an installed count of 76 and for each missing seal there a 245lb DDW penalty.

The FOMS 425 menu displays that there are 40 Slat Club seals installed on the aircraft.

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In this example (from the first screenshot), the Installed Count (76), Effect (DDW), Value Per Non Operating Component (Y), Weight (245), Unit (LBS) have been set in the FOMS 428 Menu. From the FOMS 425 menu there are 40 Slat Bulb seals installed on the aircraft. There are 36 seals missing (76 -40), so an enroute climb penalty is applied  for each missing seal and DDW is increased by 8820lbs ( 36 * 245) .

This information is displayed in the Info panel on the Plan screen under the Acft tab.

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