9 RIESGOS DE LA MAQUINARIA DE OBRAS PÚBLICAS Y MEDIDAS
9.2 RETROEXCAVADORA SOBRE ORUGAS O NEUMÁTICOS
What does the APU GEN % indication mean ? What does the APU GEN % indication mean ? What does the APU GEN % indication mean ?
APU GEN shares 36% of the
APU GEN shares 36% of the elecelecnetwork network load, the remaining 64% being taken by load, the remaining 64% being taken by the external power.
the external power.
APU GEN is supplying the network at 36% APU GEN is supplying the network at 36% of its maximum load.
of its maximum load.
The external power is supplying the The external power is supplying the network.
During preliminary procedure to check the battery voltage, the associated BATT pb sw should be: During preliminary procedure to check the battery During preliminary procedure to check the battery voltage, the associated BATT
voltage, the associated BATT pbpbswswshould be:should be:
Switched ON. Switched ON.
Switched OFF. Switched OFF.
Any position, the voltage indication being Any position, the voltage indication being all time available.
The minimum battery voltage for normal operation should be:
The minimum battery voltage for normal operation The minimum battery voltage for normal operation should be: should be: 24V. 24V. 25,5V. 25,5V. 28V. 28V.
The EXT PWR AVAIL illuminated green on the overhead panel means that :
The EXT PWR AVAIL illuminated green on the The EXT PWR AVAIL illuminated green on the overhead panel means that :
overhead panel means that :
The ground cart is supplying the aircraft The ground cart is supplying the aircraft network.
network.
The external power is plugged in and The external power is plugged in and delivers bleed air.
delivers bleed air.
The connected ground cart voltage and The connected ground cart voltage and frequency are normal.
On EXT PWR pb sw, the illuminated cyan light means that:
On EXT PWR
On EXT PWR pbpbsw, the illuminated cyan light sw, the illuminated cyan light means that:
means that:
The ground cart is supplying the aircraft The ground cart is supplying the aircraft electrical network.
electrical network.
External power is plugged in but not External power is plugged in but not supplying the network.
supplying the network.
External power is plugged in and delivers External power is plugged in and delivers bleed air only.
After starting engine n°2, is the present ECAM ELEC page a correct configuration?
After starting engine n
After starting engine n°°2, is the present ECAM 2, is the present ECAM ELEC page a correct configuration?
ELEC page a correct configuration?
No. ENG GEN n
No. ENG GEN n°°2 should power all 2 should power all aircraft network.
aircraft network.
No. The APU GEN should continue No. The APU GEN should continue powering all aircraft network.
powering all aircraft network.
Yes. ENG GEN n
Yes. ENG GEN n°°2 is now powering its 2 is now powering its own side.
You have to switch each battery on by its You have to switch each battery on by its associated
associated pbpbswswto check the voltage.to check the voltage. As you enter in the dark cockpit you first check the battery voltages.
What are the necessary checks before checking the voltages?
As you enter in the dark cockpit you first check the As you enter in the dark cockpit you first check the battery voltages.
battery voltages.
What are the necessary checks before checking the What are the necessary checks before checking the voltages?
voltages?
You must check that the external power is You must check that the external power is available and then switch it on.
available and then switch it on.
You can read the battery voltages You can read the battery voltages immediately. No actions are required. immediately. No actions are required.
In flight, following an AC BUS 1 FAULT, AC ESS FEED pb sw must be depressed in order to: In flight, following an AC BUS 1 FAULT, AC ESS In flight, following an AC BUS 1 FAULT, AC ESS FEED pb
FEED pb swswmust be depressed in order to:must be depressed in order to:
Recover AC ESS FEED from AC BUS 2. Recover AC ESS FEED from AC BUS 2.
Recover AC1 bus. Recover AC1 bus.
Recover AC2 bus. Recover AC2 bus.
AC BUS 1 FAULT will definitively lead to the DC and AC ESS buses loss:
AC BUS 1 FAULT will definitively lead to the DC AC BUS 1 FAULT will definitively lead to the DC and AC ESS buses loss:
and AC ESS buses loss:
Yes. Yes.
No. Only AC ESS bus is recoverable. No. Only AC ESS bus is recoverable.
No. DC and AC ESS buses will be No. DC and AC ESS buses will be recovered by pushing on the AC ESS recovered by pushing on the AC ESS FEED
Following an AC BUS 1 fault, pushing the AC ESS FEED pb sw on ELEC overhead panel allows you: Following an AC BUS 1 fault, pushing the AC ESS Following an AC BUS 1 fault, pushing the AC ESS FEED
FEED pbpb swswon ELEC overhead panel allows you:on ELEC overhead panel allows you:
To recover the AC ESS BUS power only. To recover the AC ESS BUS power only.
To recover the DC ESS BUS power only. To recover the DC ESS BUS power only.
To recover AC and DC ESS buses. To recover AC and DC ESS buses.
To recover AC BUS 1 power. To recover AC BUS 1 power.
Following the RAT extension due to ELEC EMER CONF, the RAT and EMER GEN FAULT light is illuminated.
What does it mean?
Following the RAT extension due to ELEC EMER Following the RAT extension due to ELEC EMER CONF, the RAT and EMER GEN FAULT light is CONF, the RAT and EMER GEN FAULT light is illuminated.
illuminated.
What does it mean? What does it mean?
We had an ELEC EMER configuration, the We had an ELEC EMER configuration, the RAT is extended.
RAT is extended.
The fault stays illuminated even after The fault stays illuminated even after emergency generator connection. emergency generator connection.
The emergency generator is not The emergency generator is not connected.
In case of ELEC EMER CONF, LAND ASAP in red is displayed on the E/WD.
This message will stay:
In case of ELEC EMER CONF, LAND ASAP in red is In case of ELEC EMER CONF, LAND ASAP in red is displayed on the E/WD.
displayed on the E/WD. This message will stay: This message will stay:
As long as the Red warning ELEC EMER As long as the Red warning ELEC EMER CONF persists.
CONF persists.
Even after having reset one generator Even after having reset one generator successfully.
successfully.
Even if BUS TIE pb
Even if BUS TIE pb swswis pushed.is pushed.
Even if APU is started. Even if APU is started.
In case of an ELEC EMER CONFIG situation, how can the two sides of the electrical system be segregated e.g to isolate a short circuit ?
In case of an ELEC EMER CONFIG situation, how In case of an ELEC EMER CONFIG situation, how can the two sides of the electrical system be can the two sides of the electrical system be segregated e.g to isolate a short circuit ?
segregated e.g to isolate a short circuit ?
Push BUS TIE
Push BUS TIE pbpbSW located on ELEC SW located on ELEC system overhead panel.
system overhead panel.
Reset each AC generator. Reset each AC generator.
Manually lower RAT by pushing its
Manually lower RAT by pushing its pbpbSWSW
Nothing has to be done because the Nothing has to be done because the segregation is done automatically. segregation is done automatically.
Being in an EMER ELEC configuration what is happening when A/C speed drops below 140 kts? Being in an EMER ELEC configuration what is Being in an EMER ELEC configuration what is happening when A/C speed drops below 140 happening when A/C speed drops below 140 ktskts? ?
AC generators are less powerful due to AC generators are less powerful due to RAT speed decrease.
RAT speed decrease.
Electrical network is automatically Electrical network is automatically transferred to the batteries.
transferred to the batteries.
You have to stop AC generator by You have to stop AC generator by pressing the
pressing the ““MAN ONMAN ON--AUTOAUTO””pbpbswitch.switch.
You have to switch ON the both batteries. You have to switch ON the both batteries.
In ELEC EMER CONF, you are in single display mode on the ECAM.
Can you manually call an ECAM system page ? In ELEC EMER CONF, you are in single display In ELEC EMER CONF, you are in single display mode on the ECAM.
mode on the ECAM.
Can you manually call an ECAM system page ? Can you manually call an ECAM system page ?
No. The upper ECAM screen is only used No. The upper ECAM screen is only used for E/WD display.
for E/WD display.
Yes, by pressing and holding its Yes, by pressing and holding its associated
associated pbpb SW on the ECAM control SW on the ECAM control panel.
In EMER ELEC CONF, when the RAT stalls due to A/C speed decreasing, the static inverter will become active in order to supply:
In EMER ELEC CONF, when the RAT stalls due to In EMER ELEC CONF, when the RAT stalls due to A/C speed decreasing, the static inverter will A/C speed decreasing, the static inverter will become active in order to supply:
become active in order to supply:
The DC ESS. The DC ESS.
The complete DC network. The complete DC network.
The AC ESS. The AC ESS.
The AC and DC ESS. The AC and DC ESS.
In case of avionics bay smoke, GEN 1 LINE pb is selected OFF.
What will happen?
In case of avionics bay smoke, GEN 1 LINE In case of avionics bay smoke, GEN 1 LINE pbpbis is selected OFF.
selected OFF. What will happen? What will happen?
All warnings will be reset. All warnings will be reset.
The smoke in the avionic bay will be The smoke in the avionic bay will be evacuated.
evacuated.
GEN1 will be disconnected from the GEN1 will be disconnected from the network.
network.
Fire extinguisher bottle will be armed. Fire extinguisher bottle will be armed.
According to these indications, which statement is true ?
According to these indications, which statement is According to these indications, which statement is true ?
true ?
Both battery voltages are above the Both battery voltages are above the minimum of 20 V.
minimum of 20 V.
Both battery voltages are below the Both battery voltages are below the minimum of 25.5 V.
minimum of 25.5 V.
I can only check the battery voltages on I can only check the battery voltages on the ECAM ELEC page.
the ECAM ELEC page.
I can only check the battery voltages, with I can only check the battery voltages, with batteries on.
You want to recharge the batteries. How do you proceed?
You want to recharge the batteries. You want to recharge the batteries. How do you proceed?
How do you proceed?
External power is available. I only have to External power is available. I only have to switch the batteries to on and they will be switch the batteries to on and they will be charged.
charged.
I have to switch the external power and I have to switch the external power and the batteries to on and the batteries will the batteries to on and the batteries will be charged.
be charged.
I have to switch the external power to ON I have to switch the external power to ON and the batteries will be charged.
and the batteries will be charged.
I have to call a mechanic because the I have to call a mechanic because the batteries can only be charged by batteries can only be charged by maintenance.
What is the meaning of the green AVAIL light ? What is the meaning of the green AVAIL light ? What is the meaning of the green AVAIL light ?
The external power is plugged in and the The external power is plugged in and the voltage and frequency parameters are voltage and frequency parameters are normal.
normal.
The external power is plugged in. The external power is plugged in.
The external power panel door has been The external power panel door has been opened.
opened.
The AVAIL light always illuminates on The AVAIL light always illuminates on ground.
After having switched the external power to ON, you get the following indications. How do you interpret the amber generator parameters and the generator fault lights ?
After having switched the external power to ON, After having switched the external power to ON, you get the following indications. How do you you get the following indications. How do you interpret the amber generator parameters and the interpret the amber generator parameters and the generator fault lights ?
generator fault lights ?
You have to switch the generators to ON. You have to switch the generators to ON.
A failure has been detected. The A failure has been detected. The
generators will not be able to supply the generators will not be able to supply the electrical system after engine start electrical system after engine start
There is an internal self test in progress. There is an internal self test in progress. The fault lights and the amber indications The fault lights and the amber indications should disappear after 30 seconds.
should disappear after 30 seconds.
On ground these indications are normal On ground these indications are normal when the engines are not running.
Both batteries are now being charged by the external power unit.
Approximately how long does the charging process take ?
Both batteries are now being charged by the Both batteries are now being charged by the external power unit.
external power unit.
Approximately how long does the charging process Approximately how long does the charging process take ? take ? 10 minutes 10 minutes One hour One hour 20 minutes 20 minutes Several hours Several hours
After 20 minutes you check the ECAM ELEC page