Doors, Interlocks and Landing Protection
Inspect car and landing doors, interlocks, unlocking zones, sill gaps, door force, reopening devices and landing barricades.
How to study lift supervisor decisions
Practice like the responsible lift supervisor: control approval drawings, protect shaft and machine-room access, challenge unsafe interlocks, verify safety-device tests, manage rescue calmly, and keep certificates, defects and maintenance evidence inspection-ready.
Core concepts
Concept 1
Remove the lift from service until the interlock circuit is restored, tested and documented by competent personnel.
Exam cue: bridged interlock stop
Concept 2
Hold passenger service, repair and test reopening protection and door force before returning the lift to normal use.
Exam cue: door sensor failure
Concept 3
Install a rigid barricade or locked landing protection, restrict the area and record the maintenance condition until the door is restored.
Exam cue: landing opening barricade
Targeted study blocks
Simulation focus
Doors, Interlocks and Landing Protection
Inspect car and landing doors, interlocks, unlocking zones, sill gaps, door force, reopening devices and landing barricades.
Risk pitfalls and guardrails
Treating verbal permission as written authorization.
Guardrail: Avoid verbal approval, copied readings, skipped isolation, and after-the-fact record traps.
Proceeding without recording readings, isolation, PPE, or exposure-control evidence.
Guardrail: Avoid verbal approval, copied readings, skipped isolation, and after-the-fact record traps.
Choosing a generic answer without checking state variation or the latest official notice.
Guardrail: Avoid verbal approval, copied readings, skipped isolation, and after-the-fact record traps.
Memory anchors
bridged interlock stop
Remove the lift from service until the interlock circuit is restored, tested and documented by competent personnel.
door sensor failure
Hold passenger service, repair and test reopening protection and door force before returning the lift to normal use.
landing opening barricade
Install a rigid barricade or locked landing protection, restrict the area and record the maintenance condition until the door is restored.
door gap child hazard
Adjust or repair door panels, sills or guards to restore safe gaps and verify with measurement before public use.
Official source check
Verify eligibility, forms, fees, validity, and safety requirements with State Lift Inspectorates / Electrical Inspectorates / Urban Development and Public Works Authorities or the current state authority notice.
Stop-work cue
If identity, authorization, isolation, PPE, exposure limits, or emergency controls are unclear, stop work and escalate.
Record cue
Exam-safe answers protect written records, competent sign-off, instrument readings, and traceable corrections.
Shortcut trap
Fast results, verbal approval, copied certificates, and undocumented adjustments are common trap answers.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What two conditions does a landing door interlock enforce?
A technician has fitted a wire link across a door contact to keep the lift running. What is the effect?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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