B.F. Goodrich Stormscope II Series Manual

$7.00 U.S.

Series II Weather Mapping Systems

Model WX-950

Stormscope

Pilot’s Guide

for the

CLR

Rate 20

200nm

CELL

BRT

OFF

Stormscope

System Advantages

Welcome

BFGoodrichAvionics Systems, the world’s most experienced company in air-

borne thunderstorm avoidance instruments, is pleased to welcome you to the

family of tens of thousands of pilots who are enjoying the benefits of safer

flight with a

Stormscope

weather mapping system.

The Original

Don’t be fooled by

Stormscope

system look-alikes. There is only one

Stormscope

system, and only one company that makes the

Stormscope

line

of weather mapping systems. The

Stormscope

system, the original, most ac-

curate weather mapping system is now manufactured by BFGoodrich Avion-

ics Systems.

Fly with Greater Confidence

You now own the leading instrument in the world for airborne detection and

mapping of thunderstorms. Unlike any other product, your new

Stormscope

system will enable you to make better informed thunderstorm avoidance deci-

sions so you can fly more safely and with greater confidence than ever before.

Convenient Features

The advanced, patented technology in your new

Stormscope

system was

developed over many years and is so unique,so revolutionary, it surpasses all

others. Here are some of its features:

-Precisely maps electrical discharges

-Operates in 25, 50, 100, and 200 nmi ranges

-Displays airspace in 120° forward view and 360° surrounding view

-Uses a high resolution 3-inchATI CRT display/processor

Easy to Use

The

Stormscope

system is extremely user friendly as a result of extensive

ergonomic analyses by pilots from all segments of aviation and incorporation

of this information by Human Factors engineers into the

Stormscope

system

design.

Stormscope

WX-950 Pilot’s Guide

$7.00 U.S.

Series II Weather Mapping Systems

Model WX-950

Stormscope

Pilot’s Guide

for the

Methods and apparatus disclosed and described herein have been developed solely on company funds

of BFGoodrich Avionics Systems. No government or other contractual support or relationship what-

soever has existed which in any way affects or mitigates proprietary rights of BFGoodrich Avionics

Systems in these developments. Methods and apparatus disclosed herein may be subject to U.S. Pat-

ents existing or applied for. BFGoodrichAvionics Systems reserves the right to add, improve, modify,

or withdraw functions, design modifications, or products at any time without notice.

BFGoodrich FlightSystems, Inc.

Stormscope

is a registered trademark of BFGoodrich FlightSystems, Inc.

Designed and manufactured in the United States ofAmerica by

CLR

Rate 20

200nm

CELL

BRT

OFF

Safety Summary

The following warnings and cautions appear in this guide and are repeated

here for emphasis:

WARNING

The illustrations in this guide are only examples. Never use

your

Stormscope

system to attempt to penetrate a thunder-

storm. The FAAAdvisory Circular, Subject: Thunderstorms,

and the Airman’s Information Manual (AIM) recommend

that you “avoid by at least 20 miles any thunderstorm iden-

tified as severe or giving an intense radar echo.”

CAUTION

There are several atmospheric phenomena other than nearby

thunderstorms which can cause isolated discharge points in

the strike display mode. Clusters of two or more discharge

points in the strike display mode however do indicate thun-

derstorm activity when they reappear after clearing the

screen.Avoidtheclustersandyou’llavoidthethunderstorms.

In the cell display mode, even a single discharge point may

represent thunderstorm activity and should be avoided.

Stormscope

WX-950 Pilot’s Guide

Table of Contents Page

List of Illustrations .......................................................................... v

List of Tables ................................................................................... v

Chapter 1 System Description ..................................................... 1-1

General Description................................................................................... 1-1

Display/Processor .................................................................................. 1-1

Antenna .................................................................................................. 1-1

Functional Description .............................................................................. 1-2

Cell Display Mode ................................................................................. 1-2

Strike Display Mode .............................................................................. 1-3

Features...................................................................................................... 1-3

Chapter 2 Storm Mapping Principles .......................................... 2-1

Anatomy of a Thunderstorm...................................................................... 2-1

Stages of a Thunderstorm .......................................................................... 2-2

Cumulus Stage ....................................................................................... 2-2

Mature Stage .......................................................................................... 2-2

Dissipating Stage ................................................................................... 2-2

Storm Mapping Technology ...................................................................... 2-3

The

Stormscope

System and Weather Radar ....................................... 2-3

Automatic Updating............................................................................... 2-3

Chapter 3 Operation ..................................................................... 3-1

Controls and Indicators.............................................................................. 3-1

Operating Instructions ............................................................................... 3-4

Turn On the

Stormscope

System.......................................................... 3-4

Adjust the Screen Brightness ................................................................. 3-4

Switch to the MENU Screen.................................................................. 3-6

Scroll Through the Menu Items ............................................................. 3-6

Switch to a Weather View ...................................................................... 3-6

MethodA............................................................................................ 3-6

Method B............................................................................................ 3-7

Switch Between Weather Views............................................................. 3-7

Select the Range..................................................................................... 3-8

ClearAll Discharge Points ..................................................................... 3-8

Switch Between WX Display Modes..................................................... 3-9

Run Operator-Initiated Self Test ............................................................ 3-9

Toggle Heading Stabilization On and Off............................................ 3-10

Turn Off the

Stormscope

System ....................................................... 3-11

Continuous Self Test................................................................................ 3-11

Error Messages ........................................................................................ 3-12

Non-Fatal Faults................................................................................... 3-14

Recoverable Faults ........................................................................... 3-15

Weather-Mapping-Inhibited Faults ............................................... 3-15

Heading-Related Faults ................................................................ 3-15

Stormscope

WX-950 Pilot’s Guide iii

Table of Contents (Continued) Page

Non-Recoverable Faults ................................................................... 3-15

Fatal Faults........................................................................................... 3-16

Chapter 4 Weather Display Interpretation ................................... 4-1

Introduction ............................................................................................... 4-1

Radial Spread ......................................................................................... 4-2

Typical Patterns ......................................................................................... 4-2

Three Clusters within the 200 nmi Range Ring..................................... 4-2

Two Clusters within the 200 nmi Range Ring ....................................... 4-4

Mapping Headings Past Thunderstorms .................................................... 4-4

Range Set at 200 nmi ............................................................................. 4-4

Aircraft Progresses 100 nmi................................................................... 4-5

Range Changes to 100 nmi .................................................................... 4-5

Aircraft Turns toAvoid Thunderstorms ................................................. 4-5

Special Patterns ......................................................................................... 4-7

Randomly Scattered Discharge Points ................................................... 4-7

Cluster and Splattering Within 25 nmi................................................... 4-7

Discharge Points OffAircraft’s Nose..................................................... 4-9

Line of Discharge Points While Taxiing .............................................. 4-10

Developing Cluster Within the 25 nmi Range Ring ............................ 4-11

Chapter 5 Specifications, Maintenance, & Service ..................... 5-1

Specifications ............................................................................................ 5-1

Maintenance & Service ............................................................................. 5-2

Chapter 6 Warranty Information .................................................. 6-1

Introduction ............................................................................................... 6-1

Warranty Statement ................................................................................... 6-1

Related Policies and Procedures................................................................ 6-2

Appendix A Dealer Information & Annual Performance Check .. A-1

Dealer Information ................................................................................... A-1

Equipment Information ............................................................................ A-1

Annual Performance Checks .................................................................... A-1

Table of Contents Stormscope

WX-950

iv Pilot’s Guide

List of Illustrations

Figure Title Page

1-1 WX-950 System Components..................................................... 1-1

1-2 WX-950 Functional Diagram...................................................... 1-2

1-3 WX-950 Weather Views .............................................................. 1-3

2-1 Electrical Discharges in Thunderstorms...................................... 2-1

2-2 Discharge Rate a Function ofWind Shear .................................. 2-2

3-1 Controls and Indicators ............................................................... 3-1

3-2 Self Test In Progress.................................................................... 3-5

3-3 Self Test OK ................................................................................ 3-5

3-4 360° Weather View at 200 nmi Range ........................................ 3-5

3-5 MENU Screen with Weather View Highlighted.......................... 3-6

3-6 Switching Between Weather Views............................................. 3-7

3-7 MENU Screen with WX Display Highlighted ............................ 3-9

3-8 MENU Screen with Self Test Highlighted ................................ 3-10

3-9 MENU Screen with HDG Stabilize Highlighted ...................... 3-11

3-10 MENU Screen with HDG Stabilize N/A .................................. 3-11

3-11 Error Message for a Recoverable Weather Fault....................... 3-12

3-12 Weather Mapping Inhibited Screen ........................................... 3-15

3-13 Error Message for a Heading-Related Fault.............................. 3-16

3-14 Weather View with a Heading Flag........................................... 3-16

3-15 Error Message for a Fatal Fault................................................. 3-16

4-1 Airspace Diagram........................................................................ 4-1

4-2 Three Clusters Within 200 nmi ................................................... 4-3

4-3 Range Changed to 100 nmi ......................................................... 4-3

4-4 Two Clusters Within 200 nmi...................................................... 4-4

4-5 Range Set at 200 nmi .................................................................. 4-5

4-6 Aircraft Progresses 100 nmi........................................................ 4-6

4-7 Range Changes to 100 nmi ......................................................... 4-6

4-8 Aircraft Turns To Avoid Thunderstorms ..................................... 4-7

4-9 Randomly Scattered Discharge Points ........................................ 4-8

4-10 Cluster and Splattering Within 25 nmi........................................ 4-8

4-11 Discharge Points OffAircraft’s Nose .......................................... 4-9

4-12 Line of Discharge Points While Taxiing ................................... 4-10

4-13 Developing Cluster Within 25 nmi Range Ring ....................... 4-11

List of Tables

Table Title Page

3-1 Controls and Indicators ............................................................... 3-1

3-2 Error Messages.......................................................................... 3-12

5-1 WX-950

Stormscope

System Specifications............................. 5-1

Stormscope

WX-950 Pilot’s Guide v

Stormscope

WX-950 System Description

Pilot’s Guide 1-1

Display/Processor

The display/processor mounts into any standard 3-inch ATI cutout in the

aircraft instrument panel. The display/processor houses two main func-

tional components: a high resolution, raster scan CRT display with a dedi-

cated graphics controller, and two powerful processors on which the

Stormscope

software runs. The processors are reprogrammable to allow

for future enhancements to the lightning detection software.

Antenna

This combined crossed-loop and sense antenna is sealed in an aerodynamic

flat-pack and mounted on the outside of the aircraft. The

Stormscope

systemcancorrelatetheelectricandmagnetic signatures of lightning strikes

Stormscope

WX-950 Pilot’s Guide

Chapter 1

System Description

General Description

The

Stormscope

Series IIWeather Mapping System,model WX-950 detects

electrical discharges associated with thunderstorms within a 200 nmi radius

of the aircraft and displays the location of the associated thunderstorms.

The

Stormscope

system is a passive system that listens for electromagnetic

signals with a receiving antenna. There’s no transmitter and no harmful trans-

missions. The system operates as well on the ground as in the air, thereby

giving the pilot important planning information even before takeoff.

Figure 1-1 shows the two major components of the Stormscope®system. Fig-

ure 1-2 shows how the components are connected to each other and to other

aircraft systems.

Figure 1-1. WX-950 System Components

Display/Processor

Antenna

1-2 Pilot’s Guide

System Description Stormscope

WX-950

better than other systems due to its patented sense channel technology. The

antenna has also been improved for the model WX-950

Stormscope

sys-

tem to help filter out pulsed noise from sources other than atmospheric

electrical discharges.

CLR

Rate 20

200nm

CELL

BRT

OFF

Discharge Signals

Test Strike

Control

Heading

Input

Power Input

±12 V dc

External

Clear

Input*

*Not Required

Comm

Mic

Inhibit*

Display/Processor

Stormscope

Model WX-950

Power

Input

11–32 V dc

Heading

Valid

Input

Electromagnetic Signals Radiating from

Atmospheric Electrical Discharges

Associated with Thunderstorms

Antenna

Figure 1-2. WX-950 Functional Diagram

Functional Description

The antenna detects the electric and magnetic fields generated by intra-cloud,

inter-cloud, or cloud-to-ground electrical discharges that occur within a 200

nmi radius of the aircraft and sends the resulting “discharge signals” to the

display/processor.The processor digitizes, analyzes, and converts the discharge

signals into range and bearing data then stores the data in memory. The

Stormscope

system displays discharges as storm cells or strikes depending

on the display mode selected. (See figure 1-3.)

Cell Display Mode

In the cell display mode, the

Stormscope

system plots a “+” symbol (dis-

charge point) on the display when it detects associated discharges within

the selected range and view. The processor will plot another “+” close to

the first for each additional discharge determined to be associated with the

group. The processor will not plot a “+” for any discharge not associated

with a group unless it’s detected within a 25 nmi radius of the aircraft. The

effect of this clustering algorithm is to display the location of storm cells

instead of individual discharges.The cell display mode is most useful dur-

ing periods of heavy electrical discharge activity. Using the cell display

mode during these periods frees the pilot from sifting through a screen full

of discharge points to determine exactly where the storm cells are located.

Stormscope

WX-950 System Description

Pilot’s Guide 1-3

360° View, CELL Display Mode 120° View, STRIKE Display Mode

Figure 1-3.WX-950 Weather Views

CLR

Rate 20

200nm

CELL

BRT

OFF

CLR

Rate 16

200nm

STRIKE

BRT

OFF

Strike Display Mode

In the strike display mode, the

Stormscope

system immediately plots an

“x” symbol (discharge point) on the display for each individual discharge

it detects within the selected range and view. The strike display mode plots

discharge points on the display in relation to where the discharges are actu-

ally detected instead of plotting them close to an associated group of dis-

charge points as is done in the cell display mode. The strike display mode

is most useful during periods of light electrical activity because it may plot

discharges associated with a building thunderstorm sooner than the cell

display mode would.

Features

• Four operator-selectable weather ranges:

–25 nmi

–50 nmi

–100 nmi

–200 nmi

• Two operator-selectable weather views (figure 1-3):

–360° view of surrounding airspace

–120° forward view

• Three types of self test:

–Power-up self test

–Continuous self test

–Operator initiated self test

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